单项选择题

I didn't go to the theater last night, ________ I had to finish my book report.

A．as
B．if
C．till
D．though
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单项选择题
Look at the terrible situation I am in! If only I ________ your advice.
A．had followed
B．would follow
C．follow
D．have followed
单项选择题
The teacher told the children there ________ four seasons in a year: spring, summer, autumn and winter.
A． is
B．was
C．are
D．were
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