问题标题：
【theteacheraskedthestudents().a.whethertheyhadeverseenthefilmavatartwomonthsagob;thattheyhadeverseenthefilmavatartwomonthsbeforec;iftheyhadererseenthefilmavatartwomonrhsbefored;whethertheyhaveeverseenthefilmav】
问题描述：
theteacheraskedthestudents().a.whethertheyhadeverseenthefilmavatartwomonthsago
b;thattheyhadeverseenthefilmavatartwomonthsbefore
c;iftheyhadererseenthefilmavatartwomonrhsbefore
d;whethertheyhaveeverseenthefilmavarartwomonthbefore
戴艺回答：
C
iftheyhadeverseenthefilmAvatartwomonthsbefore.
第一,这是个过去的过去的时态,因此用过去完成时.
第二,完成时不与表示时间的点的词ago连用,而改为表示时间段的词before
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