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【题目】 It has been much easier for me to go to work shared bikes appeared.

But they also caused plenty of problems.

A. sinceB. beforeC. whenD. while

【答案】A

【解析】

句意:—自从共享单车出现了,对我而言上班更加方便了。 但是他们也引起了大量的问题。A. since意为自从B. before意为之前C. when意为“当…时候”;D. while意为时候;然而。故选A

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