单项选择题

A．estimates
B．principles
C．regulations
D．practices
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单项选择题
A．in additionB．thereforeC．what’s moreD．however
A．in addition
B．therefore
C．what’s more
D．however
单项选择题
A．Write a report.B．Join his friends.C．Go to the laboratory.D．Go to the party.
A．Write a report.
B．Join his friends.
C．Go to the laboratory.
D．Go to the party.
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