摘要： I think that c stamps must be fun.

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--I think that collecting stamps must be fun.
--____

A.
I don't think so.
B.
I think also.
C.
I don't think so, either.
D.
I think, too.

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I think that ________ stamps must be fun．

A．collect

B．collects

C．collecting

D．to collect

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