Scientists overcame (克服) much difficulty they had _____ that technological probl
题型：期中题难度：来源：
| Scientists overcame (克服) much difficulty they had _____ that technological problem _____ they finally could send the manned (载人的) spaceship up into space. |
A. to solve; until
B. solving; before
C. to solve; before
D. solving; until |
答案
举一反三
| Lucy is going to have difficulty finding a good job _____ she graduates from a key university. |
A. as if
B. even if
C. so that
D. as usual |
| Many of them turned a deaf ear to her advice, _____ they knew it to be valuable. |
A. even though
B. now that
C. as if
D. as long as |
— Why didn"t you tell him about the meeting?
— He rushed out of the room ___ I could say a word. |
A. before
B. until
C. when
D. after |
| ______ I"m well again, I can go on with my work. |
A. Even if
B. As though
C. Ever after
D. Now that |
| We were about to climb up to the top of the mountain _____ it began to rain heavily. |
A. as
B. while
C. when
D. since |
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