未分类题

Please______the safety seal has not been broken before using this product.
A.make
B.agree
C.ensure
D.investigate

A.
A.make
B.agree
C.ensure

【参考答案】

C
解析:这道题要求选择适合句意的谓语动词。空格处的词必须能与空格后的the safety seal连用,并且符......

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