单选题
As the plane flew off towards the mountains in the distance the sound of its engines gradually________ .
A、
died away
B、
sank down
C、
dropped off
D、
went out
【正确答案】
A
【答案解析】
随着飞机飞向远处的山脉，引擎的声音逐渐消失。 [答题点拨] die away渐息，渐弱。sink down沉落。drop off离开，散去；逐渐减少。go out出去；熄灭；过时。
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