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【单选题】

_____ a certain doubt among the workers as to whether he could finish the task in a short time.

A.
It was
B.
There had
C.
There existed
D.
It had
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参考解析:
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举一反三

【单选题】Mr.Wang _____ table tennis well, though he suffers from a waist pain and _____ it for a long time.

A.
played; has not played
B.
plays; had not played
C.
plays; did not play
D.
plays; has not played