单项选择题

______ we can get rid of pollution is still a big problem.

A．Whether
B．If
C．that
D．what
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单项选择题
I took the glass very carefully lest it______.
A．should damage
B．would damage
C．had damaged
D．should be damaged
单项选择题
Mr. Smith said that he did not want to ______ any further responsibilities.
A．take on
B．get on
C．put up
D．look up
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