有关情态动词的选择
问题描述：
有关情态动词的选择
My brother _____ be really difficult at times even though he’s a nice boy in general．
\x05A．shall \x05B．should \x05C．can \x05D．must
这题选C,我选了D,
答
can 表示一般普遍的情况
It can be rather difficult to solve the problem.
must只有命令义