单项选择题

When we are introduced to the ancient building, many of us believe that the walls of the building needed______.

A．to repair
B．to have repaired
C．being repaired
D．repairing
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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
The sun warms the earth,______makes it possible for plahts to grow.
A．this
B．that
C．which
D．what
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