“thanks” is polite when someone has done you a favour, but saying it too often is quite another thing.
A．Though sayingB．If sayingC．SayingD．In spite of saying
C

試題分析：句意：當(dāng)別人幫你忙的時候，說“謝謝”是禮貌的，但是說的太頻繁又是另外一件事。這里第一個is是謂語，前面的是主語，用動名詞做主語，所以選C。
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