单项选择题

Only after I mailed the letter ______ that I had forgot to put a stamp on it.

A．I remembered
B．did I remember
C．I didn't, remember
D．didn't I remember
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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
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
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