单项选择题

By the time you get to Shanghai tomorrow, I （） for Chongqing.

A．am leaving
B．will leave
C．shall have left
D．had left

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单项选择题
We could not have fulfilled the task in time if it （） for their help.

A．was not
B．is not
C．had not been
D．has not been
单项选择题
Li Lei didn't meet the famous American professor （） he was on holiday in America last year.

A．unless
B．until
C．if
D．whether
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