单项选择题

Some words are hard to ______ because they have many different uses.

A. express
B. explain
C. define
D. describe
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单项选择题
After driving for thirty miles, she suddenly realized that she ______ in the wrong direction.
A. was driving
B. drove
C. had drove
D. had been driving
单项选择题
But you have to study hard, ______
A. mustn't you
B. won't you
C. don't you
D. oughtn't
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