They were abroad during the months when we were carrying out the investigation, or they toour help.A. would have come B. could comeC. have come D. had come 题目和参考答案——青夏教育精英家教网—

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They were abroad during the months when we were carrying out the investigation, or they _____ toour help.

A. would have come B. could come

C. have come D. had come

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