The consultant______his business if he had advertised.

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问题 The consultant______his business if he had advertised.

选项 A、doubled
B、will double
C、would double
D、could have doubled

答案D

解析 A past unreal condition that uses the past perfect in the if-clause uses could have or would have and the past participle in the result clause. Choice (A)is the past tense. Choice(B)is the future. Choice(C)is the present conditional.
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