Question

6.(2014 珠海—模) The twin sisters have learned a lot       they came to China.

   A. when   B. after   C. since   D. as soon as

Answer 1

6. C

6. C

句意：自从这对双胞胎姐妹来到中国，她们已经学到了很多。when “当...的时候”；after “在...之后”；since “自从”引导的从句用一般过去时，主句用现在完成时态；as soon as“   ...就...”。故正确答案为C项。