问题描述：
they arrived ___London__a cold winter morning.A,at;in B,in;on C,at ;on D,in;at
Must we turn off the TV now?
no,you____now,but you ___when baby is sleeping.
A,needn't...need B,mustn't...must C,mustn't...need D,needn't...must
his mother kept telling him that he should work harder,but___didn't help.
A,she B,he C,which D,it
he can't be at school,___?
A,is he B,isn't he C,can he D,can't he
Must we turn off the TV now?
no,you____now,but you ___when baby is sleeping.
A,needn't...need B,mustn't...must C,mustn't...need D,needn't...must
his mother kept telling him that he should work harder,but___didn't help.
A,she B,he C,which D,it
he can't be at school,___?
A,is he B,isn't he C,can he D,can't he
问题解答：
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