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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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

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

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