難度：★ 考點：狀語從句
1. ________ I was in he US, I made a lot of American friends.
A. While B. Although C. Unless D. Until
2. What would happen if he ______ back home?
A. go B. goes C. went
3. If a polar bear_____, it _____fish from the water.
A. will be hungry; catches B. is hungry; will catch
C. is going to be hungry; catches D. is hungry; won't catch
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