问题

His ability has never been in doubt—-the question is ___________ or not he is prepared to work hard

A:that
B:if
C:where
D:whether

正确答案是：

同类题型

come to ask for some advice at any time —Yes, of course. .

Young students are______ not to smoke bothin and out of school.

Cindy, I don’t have a partner to practice . Would you like to be my partner— Sure. Let’s do it together.

The bridge ______next month depends on money collected among the villagers. [ ]

al-name policy for train tickets has beenapplied to all trains since January 1,2012 in China, ______ I think will makeit easy for people to get tickets