单项选择题

The digestive enzyme pepsin breaks down proteins into components ______ readily absorbed by the human body.

A．that can be
B．and are
C．which they
D．are to be
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单项选择题
We had difficulties at first but everything worked ______ smoothly in the end.
A．off
B．out
C．away
D．up
单项选择题
The children went there to watch the iron tower ______.
A．to erect
B．be erected
C．erecting
D．being erected
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