单项选择题

I'm sure the letter won't arrive in time ______ it is sent by air.

A. if
B. until
C. because
D. unless
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单项选择题
I didn' t go with them to the beach yesterday. But I do wish I ______ there.
A. had been
B. have been
C. was
D. am
单项选择题
I hope they ______ this road by the time we come back next summer.
A. have repaired

B. will repair
C. are to repair

D. will have repaired
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