what do they usually do_________saturday evening?a ay b in c on d for

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what do they usually do_________saturday evening?a ay b in c on d for
what do they usually do_________saturday evening?
a ay b in c on d for

what do they usually do_________saturday evening?a ay b in c on d for
C
肯定对
考点,时间前面的介词
in+年份/月份
on+具体的某一日
by+具体时间点,表示到.时间为止,时态用过去完成时,或者将来完成时
for+一段时间,表示.了多久,时态用现在完成时