I never doubt his advice is of great to me.A. that; valuableB. if; valueC. whether; valu

问题补充：

I never doubt his advice is of great to me.

A. that; valuable

B. if; value

C. whether; valuable

D. that; value

答案：

A. that; valuable

B. if; value

C. whether; valuable

(答案→)D. that; value

解析：考查固定短语。never doubt 后面用that ，be of great value = be valuable .

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