【題目】You must be careful ________ electricity. It's dangerous.

A. to B. at C. with D. for

【答案】C

【解析】

句意：你一定要小心電，它是危險(xiǎn)的�？疾榻樵~。A. to到；B. at在；C. with和…一種；D. for為了。根據(jù)You must be careful ____ electricity. It's dangerous.可知句意為：你一定要小心電，它是危險(xiǎn)的。be careful with是固定短語(yǔ)，意思是“小心”，囑咐別人小心做事，故答案選C。

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