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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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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The mother didn't know who（）for the broken window.
A．blamed
B．to blame
C．be blamed
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单项选择题
（）the cause, they were able to propose to a remedy.
A．Found
B．Having found
C．Have found
D．Having been found
