单项选择题

He spent a lot of time ______ learning English.

A．in
B．on
C．with
D．to
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单项选择题
The sun will burn you ______ you're not careful.
A．if
B．and
C．but
D．unless
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
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