Unpleasant symptoms can cause the smoker to resume smoking to raise the levels of nicotine in the blood.

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问题 Unpleasant symptoms can cause the smoker to resume smoking to raise the levels of nicotine in the blood.

选项 A、let down
B、go about
C、drop off
D、return to

答案D

解析 该句意为:身体不舒服的症状可能使吸烟者复吸,以提高血液中尼古丁的含量。resume:恢复,重新;let down:使……失望;go about:处理;drop off:减少,降低,人睡;return to:回到,重新
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