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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