单项选择题

He did poorly in his examination,______ how hard he had studied for them.

A．considering
B．to consider
C．thinking
D．regarding
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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
单项选择题
It's true that the old road is less direct and a bit bumpy. We won't take the new one ______because we feel as safe on it.
A．however
B．though
C．nevertheless
D．whatsoever
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