There is a stranger outside. I have been______ (密切注意他) for a while.keeping an ey

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问题 There is a stranger outside. I have been______ (密切注意他) for a while.

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答案 keeping an eye on him

解析 “密切注意某人”用固定短语keep an eye on sb．表达。have been提示此处为现在完成进行时，故本题答案为keeping on an eye on him。

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