A flashing red light ______ motorists to trouble ahead.

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问题 A flashing red light ______ motorists to trouble ahead.

选项 A、reminded
B、alerted
C、warned
D、cautioned

答案B

解析 动词辨析题。alert sb.to do sth.意思是“使…处于戒备,警告…做…准备”;remind常与of,to do sth.,that连用,意思是“使想起,提醒”;warn意思是“警告,通知”,搭配是warn sb.against sth.,warn sb.off sth.;caution意思是“谨慎,警告”。
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