【題目】Before Liam crossed the street, he stood watching for the traffic ________ to change.

A. signal B. sight

C. rule D. post

【答案】A

【解析】考查名詞辨析。句意：Liam在穿過街道前，他站著等交通信號燈改變。A. signal信號；B. sight視野；C. rule規(guī)則；D. post職位。根據(jù)語境，故選A。

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