单项选择题

How do you account for your absence from the class last Thursday

A. explain
B. examine
C. choose
D. expand
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About one quarter of the workers in the country are employed in factories.
A. third
B. fourth
C. tenth
D. fifteenth
单项选择题
She was grateful to him for being so good to her.
A. careful
B. hateful
C. beautiful
D. thankful
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