Question

【题目】一 It has been much easier for me to go to work shared bikes appeared.

一 But they also caused plenty of problems.

A. sinceB. beforeC. whenD. while

Answer 1

【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“在…之前”；C. when意为“当…时候”；D. while意为“当…时候；然而”。故选A。