内容正文:
时间状语从句:
1.To avoid the virus (病毒), we should wash hands more carefully ________ we have meals.
A.so B.before C.because D.although
2.—The play had already been on for quite some time when we ________ at the New Theatre.
—What a pity! It is really worth seeing.
A.have arrived B.arrived C.had arrived D.arrive
3.Lucy didn’t go to bed ________ she finished her homework last night.
A.after B.as soon as C.until D.while
4.I will return it to the library _______ I finish reading Little Women.
A.no longer B.as soon as C.so that
5.—Did you catch the early bus this morning?
—No, the bus started to move ________ I could get on it.
A.when B.before C.until D.after
6.I won’t believe you ________ I have seen it with my own eyes.
A.when B.until C.after
7.________ we got together during the Spring Festival of 2022, three Chinese astronauts were on duty in outer space.
A.Since B.If C.As D.Although
8.—Has the meeting begun yet?
—Not yet. We have to wait _________ everyone is here.
A.for B.unless C.until D.as
9.________ astronauts go on spacewalks, they wear spacesuits to keep themselves safe.
A.Though B.Till C.When D.Unless
10.They have been friends ________ they first met.
A.since B.while C.before D.after
原因状语从句
1.Tom got all A’s ________ he spent most of his time studying.
A.if B.before C.because D.although
2.Protecting wildlife is without doubt an important part, ________ each animal on Earth has a role to play in the ecosystem.
A.since B.though C.unless D.if
3.Robert failed in the final term exams________ he didn’t take the subject seriously.
A.because B.that C.till D.though
4.________ we have a few minutes to wait for the train, let’s have a cup of coffee.
A.Although B.Until C.Since D.Unless
5.________ you have finished most of your homework at school, you needn’t stay up late to do it.
A.Before B.Until C.Since D.When
6.I went over my paper again and again ________ I don’t want to make any mistakes.
A.and B.because C.if D.until
7.We often give up chance