It was the training he had as a young man made him such a good engineer.A. what; thatB.

问题补充：

It was the training he had as a young man made him such a good engineer.

A. what; that

B. that; what

C. that; which

D. which; that

答案：

A. what; that

B. that; what

C. that; which

(答案→)D. which; that

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