However，somemistakes________becauseth

发布时间：2020-07-26 14:34:52

However，some mistakes ________because the center of the eye，which is very sensitive in daylight，is not as sensitive as the sides of the eye after dark．A.are happenedB.will be happenedC.happenD.have happened

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C解析happen是不及物动词，从句意知这里所指的为一般情况。
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