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
The children went there to watch the iron tower ______.
A．to erect
B．be erected
C．erecting
D．being erected
单项选择题
Jack ______ from home for two days now, and I am beginning to worry about his safety.
A．has been missing
B．has been missed
C．had been missing
D．was missed
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