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【单选题】

They have not made any decision on ______ they are going to do to deal with the waste and control pollution.

A.
that
B.
which
C.
if
D.
what
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参考答案:
参考解析:
.
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举一反三

【单选题】Every possible means ____, but none ____ successful.

A.
has tried; has proved
B.
tried; proves
C.
has been tried; proves
D.
is being tried; is proved