单项选择题

How many ______ known altogether

A．species of fishes are
B．species of fish is
C．specieses of fish are
D．species of fish are
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单项选择题
The sun is shining in the sky and sending out ______ light and heat.
A．a large number of
B．a great many
C．a large amount of
D．a lot
单项选择题
We ______ trouble from people who like leaving things around.
A．used to have
B．have always had
C．are always having
D．had
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