The security of the passengers is supposed to ______ by the captain.A、see toB、s

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问题 The security of the passengers is supposed to ______ by the captain.

选项 A、see to
B、seeing to
C、be seen to
D、seen to

答案 C

解析 see to是“负责，注意”的意思，主语通常是人。而此句的主语是security，应该是谓语动词的宾语，所以此句应该用被动语态，因此正确答案是C。

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