单项选择题

The scientists often meet with problems that______new type of instruments for their solution.

A. inquire
B. require
C. acquire
D. squire
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单项选择题
At this______, we will soon be bankrupt.
A. process
B. rate
C. pace
D. measure
单项选择题
It is no good______to memorize some grammatical rules or vocabulary. You need to practice what you have learned.
A. tried
B. trying
C. to try
D. try
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