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
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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
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
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