单项选择题

He didn't know German, （） made it difficult for him to study at a university in Germany.

A. that
B. as
C. which
D. this

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单项选择题
Nobody noticed the thief slip into the house because the lights happened to（）

A. be put up
B. give in
C. be turned on
D. go out
单项选择题
Had you worked harder that time, you （） a better position.

A. could get
B. have got
C. would get
D. would have got
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