It was probably the wrong operation(操作) of the pilot that caused the plane to crash. A. b

问题补充：

It was probably the wrong operation(操作) of the pilot that caused the plane to crash.

A. because of

B. because

C. as a result

D. \

答案：

A. because of

B. because

C. as a result

(答案→)D. \

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