单项选择题

We have been good friends ______ we met at school.

A. since

B. before

C. from
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单项选择题
—I don’t know ______ he will come tomorrow.—Don’t worry. If he comes, I’ll tell you.
A. whether
B. where

C. why
单项选择题
She didn’t tell us ______.
A. how is the patient
B. how old was the patient
C. how old the patient was
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