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

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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
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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