单项选择题

The mother didn't know who（）for the broken window.

A．blamed
B．to blame
C．be blamed
D．would blame

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

A．unless
B．while
C．as
D．if
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