单项选择题

______, water is composed of two parts hydrogen and one part oxygen.

A．As is known
B．As be known
C．As known
D．Which is known
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单项选择题
He ______ leave her than a child would abandon a favorite plaything.
A．would no more
B．would rather
C．will no longer
D．may no more
单项选择题
Before Columbus set sail on his first voyage of discovery, many pooh-poohed his chances, and were unwilling to ______ on his chances of success.
A．make bets
B．make the bet
C．make a bets
D．make bet
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