问题
选择题
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
答案
答案：D
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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
答案：D