单项选择题

______ he comes, we won’t be able to go.

A. Without
B. Unless

C. Except
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单项选择题
She knows little English, ______ she
A. don’t

B. does

C. doesn’t
单项选择题
My mother is sleeping. Would you please ______ the radio
A. turn on
B. turn off
C. turn over
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