单项选择题

An old friend of mine from abroad, ______ I was expecting to stay with, telephoned me from the airport.

A. who
B. whom
C. that
D. which
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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
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
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