I have worked with him for some time and have found that he is than Jim.A. more efficient

I have worked with him for some time and have found that he is than Jim.
A. more efficiently a worker
B. a more efficient worker
C. more an efficient worker
D. a worker more efficient

A. more efficiently a workerB. a more efficient workerC. more an efficient workerD. a worker more efficient解析：B解析　考查比较结构中的名词位置。此处符合“a/an＋比较级＋名词单数＋than”句型。

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