题目内容
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 happened
- B.will be happened
- C.happen
- D.have happened
C
happen是不及物动词,从句意知这里所指的为一般情况。
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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