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
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
单项选择题
I had just started back for the house to change my clothes（）I heard shouts.

A．when
B．while
C．after
D．as
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