单项选择题

He has achieved ______ success during the past ten years.

A．considerate
B．considering
C．considered
D．considerable
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单项选择题
The scientist has made quite a few discoveries, ______ of great importance to the whole world.
A．which I think they are
B．which I think are
C．I think which are
D．that I think they are
单项选择题
Walking is believed to be one of the best ways for a person to ______ healthy.
A．reserve
B．preserve
C．stay
D．maintain
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