单项选择题

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

A．which I think it is
B．which I think is
C．that I think is
D．I think which
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单项选择题
Sylvia was in low spirits because her throat infection left her very _______ and made her solo at the party impossible.
A．dumb
B．hoarse
C．silent
D．speechless
单项选择题
The opening ceremony is a great occasion. It is essential _______ for that.
A．for us to be prepared
B．that we are prepared
C．of us to be prepared
D．our being prepared
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