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
My boss asked me to answer the phone, to take all messages, and（）some letters.

A．to type
B．typing
C．type
D．typewrite
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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