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 -
单项选择题
Never（）Josh met such a complicated situation.
A．did
B．could
C．will
D．had
