单项选择题

Early to bed and early to rise ______ very good to us.

A. is
B. are
C. will be
D. may is
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单项选择题
Only by doing so ______ the right way of delivering a successful speech.
A. you can find

B. you will find
C. would you find

D. can you find
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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