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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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

Koalas(考拉熊) use a range of sounds to communicate with one another（）relatively large distances.

A．in
B．over
C．by
D．between

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