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单选题

________ you had been here, we wouldn ’ t have had so much trouble then.

A
when
B
if
C
as
D
since

题目答案

B

答案解析

暂无解析
举一反三
单选题

When ________ to tell the difference between British and American English, the linguist made a long and ________ speech.

A
asked;tired
B
asked;tiring
C
asking;tiring
D
beasked;tired

题目答案

B

答案解析

暂无解析