teachers think students needt do so much homeworks,but they

teachers think students needt do so much homeworks,but they ___make their
teachers think students needt do a lot in tho much homeworks,but they ___make their students do a lot in the past.
A.have to B.must C.had to D.should

had to是不得不的意思,表示过去
　　整句话的意思是说：老师们认为学生不必做过多的作业,但是在过去,他们不得不让学生们做很多作业.

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