I went to the US,I visited many cities.A. First timeB. For the first timeC. The first time

I went to the US,I visited many cities.
A. First time
B. For the first time
C. The first time
D. By the first time

A. First timeB. For the first time(答案→)C. The first timeD. By the first time解析：考查连词短语。the first time第一次，为连词短语，其它选择项只能作状语，故选C。句意：我第一次去美国，我参观了许多城市。

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