I saw Helen at the party last month. It _________ a year since we met last time.
| A．was | B．is | C．has been | D．would be |
— Shall Mary come to the concert with us？
－Not_____she has finished her paper．
| A．since | B．once | C．when | D．unless |
--- Won’t you go to Kathy’s wedding party?
--- No, _____ invited.
| A．though | B．if | C．as | D．once |
---Did they tell you the final decision of the committee?
---No, they didn’t, but I think I ought to ______.
| A．/ | B．be | C．have | D．have been |
－Why didn’t Tom give you one of his paintings?
－I didn’t want one，but he would have given me one if I______.
| A．did | B．would | C．will | D．had |
_________, the weather in America is different from place to place.
| A．As China | B．Like in China | C．Like China | D．As in China |