when shall we hold the meeting? it ---be better to put it off until next weeek

问题描述:

when shall we hold the meeting? it ---be better to put it off until next weeek
a.must
b.could
c.can
d.will

b could..why为什么不是ccould没有can那么确定。表示推测,can就太绝对了d呢D 语法不错,但是习惯上没有这么说的。