单项选择题

The physicist has made a discovery, _____ of great importance to the progress of science and technology.

A．I think which is
B．that I think is
C．which I think is
D．which I think it is
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单项选择题
He left orders that nothing _____ touched until the police arrived here.
A．should be
B．ought to be
C．must be
D．would be
单项选择题
A baby might show fear to an unfamiliar adult, _____ he is likely to smile and reach out to another infant.
A．if
B．whenever
C．whereas
D．because
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