单项选择题

Mark offered to help me to learn English （）.

A．on duty
B．in vain
C．on purpose
D．in earnest

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单项选择题
It is well admitted that the high （） rate is caused in part by failure to communicate.

A．unemployment
B．birth
C．divorce
D．inflation
单项选择题
One of the attractive features of the course was the way the practical work had been （） with the theoretical aspects of the subject.（）

A．instructed
B．involved
C．interfered
D．integrated
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