单项选择题

My father ______ for a long time.

A．is smoking
B．smokes
C．smoked
D．has smoked
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单项选择题
The temple is on the edge of lake ______ has been made by the dam.
A．where
B．when
C．who
D．which
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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