题目内容：
Mary was on the point of leaving the room ___________the telephone rang.
[ ]
A. when B. while
C. as
D. but
参考答案：
单选题：Mary was on the point of leaving the room ___________the tel..
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B. while
C. as
D. but
B. while
C. as
D. but
Their country has plenty of oil, __________ ours has none.[..
Their country has plenty of oil, __________ ours has none.[ ]A. when B. while C. before D. where
I want to buy the jacket,_______ I have not enough money wit..
I want to buy the jacket,_______ I have not enough money with me.[ ] A. but B. soC. orD. for
—What's going on between you and Peter? —We had a fight. ..
—What's going on between you and Peter? —We had a fight. I regarded him as my trustworthy friend_____ to my shock, he gave me away.[ ]A. unlessB. sinceC. ifD. until
_______you are familiar with the author's ideas, try readin..
_______you are familiar with the author's ideas, try reading all the sections as quickly as you can. [ ]A. So thatB. Now thatC. Ever sinceD. As long as
Another two hours , ____we will arrive at the Capital Airpor..
Another two hours , ____we will arrive at the Capital Airport, where your uncle will be waiting for us. [ ]A. but B. / C. orD. and