Question

【题目】Tony has had to cook by himself ________ his mother went on business to Guangzhou.

A. since B. after C. during D. when

Answer 1

【答案】A

【解析】

句意：自从妈妈去广州出差以来，托尼不得不自己做饭。A. since从……以来；B. after在……之后；C. during 在……期间；D. when当……时候。since后跟时间状语从句时，表示的是到目前为止的时间段，从句时态为一般过去时，而主句的时态为现在完成时，故正确答案为A。