—What do you think we can do for our aged parents？
—You _____do anything except that you visit them as often as possible.
A. don’t have to B. oughtn’t to C. mustn’t D. shouldn’t
科目：高中地理 來源： 題型：
----What do you know the _____ of are the pig influenza in humans?
---- usually similar to regular human seasonal influenza .
A. symptoms B.sympathy C.symbol D.symptom
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