单项选择题

Many manufacturers were accused of concentrating too heavily on cost reduction, often at the of the quality of their products.（）

A. expansion
B. exposure
C. expense
D. expectation

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单项选择题
In order to make myself（）in English, I am studying hard.

A. understand
B. understanding
C. to understand
D. understood
单项选择题
We met the young couple at a party three weeks ago.（）we've had no further communication.

A. Thereof
B. Thereby
C. Thereafter
D. Thereabouts
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