单项选择题

Many a way ______ tried already.

A．has been
B．are
C．being
D．have
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单项选择题
I will tell you everything ______ he said about it.
A．what
B．which
C．that
D．on which
单项选择题
______ he will go to Germany is not decided.
A．Who
B．if
C．That
D．Whether
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