If they had asked for suggestions for this program earlier, it would certainly _

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问题 If they had asked for suggestions for this program earlier, it would certainly ______ more successful then.

选项 A、have been
B、be being
C、had been
D、be

答案 A

解析语法题。由if引导的虚拟语气，表示对过去的虚拟时，主句应用would have done的句式。故选A。

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