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【题目】—Must I turn off the gas after cooking?

—Of course. You ________ never be careful enough with that.

A. must B. can

C. may D. should

【答案】B

【解析】考查情态动词。——在做饭以后我必须关掉煤气吗?——当然。你越小心越好。“cannot/can never be too...”是固定句型,意为“越……越好”或“再……也不过分”。故选B。

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