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81.He _____ tennis every day since he ______ sixteen.

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81.He _____ tennis every day since he ______ sixteen.
A.has played...is
B.played...has been
C.was playing...has been
D.has been playing...was
选C
为什么?为什么不是选D
81.He _____ tennis every day since he ______ sixteen.
可以用现在进行时表示一种生活习惯和爱好.但是has been doing是一种持续性动作,而play不是一种持续性动作,并不能表达一种状态.所以选C.