单项选择题

I（）half an hour before she came out of the telephone box and I entered.

A．waited
B．have waited
C．had been waiting
D．was waiting

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I'll lend you my computer（）you promise to take care of it.

A．unless
B．while
C．as
D．if
单项选择题
I have not gone to see the doctor for a long time, but today（）

A．I'm going to
B．I'm going to see
C．I'm going
D．I go
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