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I think the reference book（参考书）is very helpful. （）
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I think the reference book（参考书）is very helpful. （）
A.Good ideA.
B.So do I.
C.With pleasure.
D.No problem.
参考答案:
I think the reference book（参考书）is very helpful. （）
A.Good ideA.
B.So do I.
C.With pleasure.
D.No problem.
参考答案: