单项选择题

Nobody ______ how to run this machines.

A. know

B. have known
C. knows
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单项选择题
You gave them a talk two days ago, ______ you Yes, I ______.
A. did; did

B. did; gave
C. didn’t; did
单项选择题
They’ll go to have a picnic with us if it ______ tomorrow.
A. fine

B. is fine

C. will be fine
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