问题
选择题
He _____ play the piano since he was young. He is very famous now.
A．has could
B．has been able to
C．could
D．was able to
答案
答案：B
考查时态和固定短语。根据since he was young,可知主句中用现在完成时，故排除A，C，D,选B。
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