Question

teachers think students need"t do so much homeworks,but they ___make their

teachers think students need"t 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

Answer 1

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。

Answer 2

C, had to, 因为后面说了 in the past, 过去的事情，当然要用had to

Answer 3

C、老师们认为学生们不需要做太多的作业，但是在以前他们不得不给他们的学生布置很多

Answer 4

C
不得不。in the past， 所以用过去式

Answer 5

D should有竟然的意思