单项选择题

It's late; I think I must ______ now.

A．turn back to
B．turn down
C．turn on
D．turn in
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单项选择题
Frankly speaking, your article is very good except for some ______ mistakes in grammar.
A．trivial
B．obscure
C．rare
D．glaring
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
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