单项选择题

-- You look very pale. You ______ very tired.
-- I didn't sleep at all last night.

A．must be
B．must have been
C．can be
D．can have been
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单项选择题
The old man said that this sad story may happen in ______.
A．the 1840's
B．the 1840s'
C．1840s
D．1840s'
单项选择题
I'd rather you did some housework when you are free, but you ______.
A．don't
B．didn't
C．shouldn't
D．wouldn't
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