He asked whether he (have) ______ to do the whole experiment again if he failed in a single test.

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问题 He asked whether he (have) ______ to do the whole experiment again if he failed in a single test.

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答案would have

解析 根据时态呼应原财,asked为一般过去时,其后的宾语从句要用过去时态;又因为whether引导的宾语从句本身又是一个主从复合句,从句为if引导的条件状语从句,主句用将来时态,所以此处空格应该用过去将来时。
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