【題目】 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:—自從共享單車出現(xiàn)了,對我而言上班更加方便了。 但是他們也引起了大量的問題。A. since意為自從B. before意為之前;C. when意為“當(dāng)…時候”;D. while意為當(dāng)時候;然而。故選A

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