---What should I do first before boarding? ----().
A.You may ask the policeman there to help.
B.Please go to the airline counter to check-in for your flight.
C.You should wait and see.
D.You have to go there to check in for your flight.
第1题:
A、what, to do
B、what, to do it
C、which, 不填
D、that, 不填
第2题:
10.—Can I help you?
—__________.
A. You’ re welcome
B. Yes,please
C. I-m sorry
D. Here you are
第3题:
第4题:
A. is
B. does
C. Do
第5题:
第6题:
3、目的状语从句中常含有can, could, may, might, should等情态动词。