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
We ______ to tell him the good news but found that he wasn’t in.
A. means
B. had meant
C. is meaning
D. has meant
单项选择题
I’ll consider ______ my grandma tomorrow morning, but I’m not sure if she is at home at that time.
A. visiting
B. visit

C. visited

D. to visit
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