____ his key, the man looked ____a. Lost; worried b.Losing; to be worriedc. Having lost; worried为何选C?

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____ his key, the man looked ____a. Lost; worried    b.Losing; to be worriedc. Having lost; worried为何选C?

____ his key, the man looked ____a. Lost; worried b.Losing; to be worriedc. Having lost; worried为何选C?
____ his key, the man looked ____
a. Lost; worried b.Losing; to be worried
c. Having lost; worried
为何选C?

____ his key, the man looked ____a. Lost; worried b.Losing; to be worriedc. Having lost; worried为何选C?
这里是分词作状语,可以表示“在……之后”,或者“因为”等意思,由于丢钥匙的动作在looked这个动作之前,所以用了一个完成式,句子可以翻译成,由于丢了钥匙,这个男人看起来很着急.

首先,Looked 在这里是系动词,所以,后面要加形容词,在选项中,就是worried,
接着,主句the man looked 已经是一般过去时,所以,从句就要用过去的过去,用过去完成时,
即have lost,又因为它是放在句首,动作又是由主句的主语the man做出来的,所以用having...

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首先,Looked 在这里是系动词,所以,后面要加形容词,在选项中,就是worried,
接着,主句the man looked 已经是一般过去时,所以,从句就要用过去的过去,用过去完成时,
即have lost,又因为它是放在句首,动作又是由主句的主语the man做出来的,所以用having

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C
现在分词做状语,因为lose key在前,look worried 在后,故用现在分词的过去形式——having done sth. 而look worried 是固定用法——look + adj. 这里worried 做表语,起形容词的作用。