单项选择题

Discovering consists of seeing what everybody has seen and（）what nobody has thought.

A．think
B．thinking
C．thought
D．to think

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单项选择题
After the new technology was brought in, this year's production of the cars in our factory is five times（）it was five years ago.

A．more
B．than
C．what
D．as
单项选择题
Only recently（）to realize the dangers caffeine might bring to our health.

A．that scientists began
B．have scientists begun
C．scientists have begun
D．that did scientists begin
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