单项选择题

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
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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
单项选择题
Doing your homework is a sure way to improve your test scores, and this is especially true ______ it comes to classroom tests.
A. when
B. since
C. before
D. after
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