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.
搜题请搜索小程序“爱下问搜题”
