英语选择 1.______ he has finished cleaning the room is unknown.

英语选择 1.______ he has finished cleaning the room is unknown.
A. If B. Whether C. When D. While
2.In spring it is ______ hot ______ cold here.
A. both,and B. either,or C. neither,nor D. not only, but also
3.It was raining,______ we had to stay at home.
A. or B. so C. for D. yet
4.We should study _____ he studied.
A. after B. before C. for D. as
5.Because they worked hard _____ they ,finished it in time.
A. so B. so that C. that D./
6.He was very busy then _____ he still gave much of his time to his studies.
A. but B. or C. and D.so
7.____ you work harder, you will certainly succeed.
A. Though B. If C. Because D. For