could you tell me if he_______finish the work on time?

题目

could you tell me if he_______finish the work on time?
A.could B.was able to C.is able to D.would be able
选哪个?为什么?

答案

C
Could 用于句首表示一种委婉的语气,不表示过去时,所以排除 A,B,D,
另外,if 引导的条件状语从句 用一般现在时 表示将来.进一步确定选C.
开心.