our class is going to the zoo---this weekend.a.at b.in c./ d.on

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our class is going to the zoo---this weekend.a.at b.in c./ d.on
our class is going to the zoo---this weekend.a.at b.in c./ d.on

our class is going to the zoo---this weekend.a.at b.in c./ d.on
答案是C,这个地方不需要介词,this weekend可以直接用来做状语.