1.He said,"___a long way to school.___a long way to go before we arrive."

1.He said,"___a long way to school.___a long way to go before we arrive."
答案是C为什么不选B
A.It is;It is B.There is;It is C.It is;There is D.There is；There is
2.Tom's mother kept telling him that he should work hard,but___didn't help.
答案是D为什么不选A
A.he B.which C.she D.it
3.It is difficult to get used___in a tent after having a soft,comfortable bed to lie on.
答案是B为什么不选D
A.sleep B.to sleeping C.slept D.to sleep
4.Could you tell me how many times___to Singapore?答案是D为什么不选C
A.had you been B.did you go C.have you been D.you have been