单项选择题

He has made another wonderful discovery, ______ of great importance to science.

A．which I think it is
B．of which I think it is
C．I think which is
D．which I think is
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单项选择题
He has ______ the army for ten years and is now an officer.
A．gone into
B．joined in
C．been in
D．come into
单项选择题
The patient's progress was very encouraging as he could ______ get out of bed without help.
A．nearly
B．only
C．merely
D．barely
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