单项选择题

A new system of quality control was brought in to overcome the defects in the firm's products.()

A. invested
B. introduced
C. installed
D. insisted

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单项选择题
The boy always looks through his homework before handing it in.()

A. write
B. does
C. finishes
D. examines
单项选择题
Everybody was glad to see Mary back.()

A. sorry
B. sad
C. angry
D. happy
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