单项选择题

______ evidence that language-acquiring ability must be stimulated.

A．There being
B．If being
C．It is
D．There is
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单项选择题
This suitcase is ______ heavy for me to carry.
A．enough
B．very
C．so
D．too
单项选择题
I hope they ______ this road by the time we come back next summer.
A．have repaired
B．will repair
C．are to repair
D．will have repaired
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