单项选择题

The sun will burn you ______ you're not careful.

A．if
B．and
C．but
D．unless
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单项选择题
There are thirty students in our class. Eight will go home; the rest ______ to stay at school.
A．are
B．ought to
C．should
D．is
单项选择题
If I had a dictionary, I ______ it to you yesterday.
A．would have lent
B．would lend
C．lent
D．had lent
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