单项选择题

How strange ______!

A．that the children so quiet are
B．is the children are so quiet
C．that the children are so quiet is
D．it is that the children are so quiet
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单项选择题
The children listened ______ to the words of their father.
A．respectively
B．respectfully
C．respectantly
D．respectably
单项选择题
______ complex organic catalysts originating in living cells.
A．Enzymes are
B．Enzymes while they
C．Enzymes
D．Enzymes which are
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