He plays the piano very long ( ) .A.hour B.hours C.time D.times

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He plays the piano very long ( ) .A.hour B.hours C.time D.times

He plays the piano very long ( ) .A.hour B.hours C.time D.times
He plays the piano very long ( ) .
A.hour B.hours C.time D.times

He plays the piano very long ( ) .A.hour B.hours C.time D.times
c

C

C.time
hours首先不适用于这里。
而times表示次数。

C
他弹了很长时间的钢琴

C.
大概因为
for a long time
固定搭配~