Question

【题目】Betty ___________ hard since last term. That’s why her exam results are so good!

A. has worked B. will work C. worked D. was working

Answer 1

【答案】A

【解析】句意：自上学期以来贝蒂一直努力学习。那就是她考试成绩如此好的原因！考查动词时态。since last term自从上学期以来，表示的是一段时间；work工作，动词，是持续性的。根据句意，结合句子结构，可知本句是现在完成时态，Betty是三单人称，需用has构成完成时，故选A。