单项选择题

The sun warms the earth,______makes it possible for plahts to grow.

A．this
B．that
C．which
D．what
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单项选择题
She ought to stop work; she has a headache because she______too long.
A．has been reading
B．is reading
C．had read
D．read
单项选择题
I wish that you______such a bad headache because I'm sure that you would have enjoyed the concert.
A．hadn't
B．didn't have had
C．hadn't had
D．haven't had
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