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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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
单项选择题
Don't touch that wire. It's_______.
A．living
B．alive
C．live
D．lively
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