he ___ . i saw him playing football on the playground just now.a.must have fallen ill d.may have fallen illc.can't have fallen illd.should have fallen ill写出原因!
问题描述：
he ___ . i saw him playing football on the playground just now.
a.must have fallen ill
d.may have fallen ill
c.can't have fallen ill
d.should have fallen ill
写出原因!
答
C 根据句子意思来决定,有后面的句子知道是“不可能”,推测现在的状态,完成时