the teacher asked the students( ).a.whether they had ever seen the film avatar two months ago
b;thattheyhadeverseenthefilmavatartwomonthsbeforec;iftheyhadererseenthefilmavatartwom...
b;that they had ever seen the film avatar two months before
c;if they had erer seen the film avatar two monrhs before
d;whether they have ever seen the film avarar two month before
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c;if they had erer seen the film avatar two monrhs before
d;whether they have ever seen the film avarar two month before
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C
if they had ever seen the film Avatar two months before.
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
if they had ever seen the film Avatar two months before.
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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