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!
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!
问题解答：
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