.______ he can finish his task on time i

问题选择题

.______ he can finish his task on time is of great importance.

A．Whenever

B．If

C．Whether

D．Whichever

答案

答案：C

题目分析：本题考查主语从句。B项if作为“是否”讲只能引导动词之后的宾语从句，因而排除；A,D两项与题意不合。如选A项，原题可改为“…is of no importance”。故答案为C.