单项选择题

The second book was（）by August 1982, but two years later, the end was still nowhere in sight.

A．completed
B．to have completed
C．to complete
D．to have been completed

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单项选择题

Although the town had been（）several times, little damage was done.

A．attacked
B．injured
C．harmed
D．struck

单项选择题

If（）to a high temperature, ice will change to water.

A．heating
B．being heated
C．to heat
D．heated

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