All the students were sweeping the floor __________ they heard a man __________.
题型：同步题难度：来源：
| All the students were sweeping the floor __________ they heard a man __________. |
| [ ] |
A. when；shouting
B. while；to shout
C. when；to shout
D. while；shouting |
答案
| A |
举一反三
| I was reading the evening paper _____ the light went out. |
| [ ] |
A. when
B. while
C. as
D. after |
| Newton was playing under an apple tree ____ an apple fell onto his head. |
| [ ] |
A. when
B. while
C. after
D. before |
-So you were in the supermarket __________ you heard a strange sound , right?
-That’s true. I ran out as quickly as possible. |
| [ ] |
A. when
B. while
C. then
D. which |
—What a nice T-shirt! Can I have it, Mom?
—Well, it really looks nice, ______ I think it"s too expensive. |
| [ ] |
A. but
B. as
C. for
D. or |
| Although he is rich,___________ he is unhappy. |
| [ ] |
A. but
B. because
C. so
D. / |
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