单项选择题

Doctor Adams explained that not all bacteria harmful（）.

A．were
B．are
C．was
D．is

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单项选择题
The policemen hurried to the spot of traffic accident where there was a large crowd of（）.

A．looker-on
B．lookers-ons
C．looker-ons
D．lookers-on
单项选择题
Have you ever gone water-skiing before Oh,yes（）.

A．a dozen of time
B．dozens of times
C．dozens of time
D．dozen of time
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