Question

【题目】The old man ______ run and walk since he left hospital last month.

A. will be able to B. is able to

C. has been able to D. was able to

Answer 1

【答案】C

【解析】

句意：自从这个老人上个月离开医院他就能跑，能走了。will be able to将能；is able to能；has been able to现在完成时；was able to一般过去时。句中since引导时间状语从句，意为“自从…”，常和现在完成时搭配使用，故应选C。