单项选择题

Tile student said there were a few points in the essay he ______ impossible to comprehend.

A．has found
B．was finding
C．had found
D．would find
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单项选择题
It's high time we ______.cutting down the rainforests.
A．stopped
B．had to stop
C．shall stop
D．stop
单项选择题
______ dull he may be, he is certainly a very successful top executive.
A．Although
B．Whatever
C．As
D．However
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