单项选择：The teacher makes_a duty for the students to clean the classroom every morning.A.which B.what C

题目

单项选择：The teacher makes_a duty for the students to clean the classroom every morning.A.which B.what C.that D.it 请说明正确答案,以及原因
I was late because my car was_by an accident.
A.held out b.held up C.held back D.held on
--I forgot to bring ma pen.May I use yours?
--It's in my drawer._.
A.Feel free B.Not to mention C.Never mind D.Good for you

答案

选 D it
这里 it 做形式宾语,代替后面的不定式 to clean the classroom every morning.
因为这个不定式比较长,放在它应该放的地方,会容易引起混乱,所以在原来的地方用 it 代替,而且把不定式放在句末.