单项选择题

A good many houses ______ knocked down by the earthquake.

A. was
B. were
C. is
D. are
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A doctor's obligation when he can no longer ______ the approach of death is to make the patient comfortable, including easing his pain.
A. hang around
B. hang on
C. hold back
D. hold on
单项选择题
She has bought herself ______ dress.
A. a cotton purple expensive
B. an expensive purple cotton
C. a purple expensive cotton
D. a cotton expensive purple
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