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[主观题]
A．have helped'B．helpedC．had helpedD．was helped
A．have helped'
B．helped
C．had helped
D．was helped
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题目内容
（请给出正确答案）
如果结果不匹配，请 联系老师 获取答案
题目内容
（请给出正确答案）
A．have helped'
B．helped
C．had helped
D．was helped
如果结果不匹配，请 联系老师 获取答案
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A.have helped
B.helped
C.had helped
D.was helped
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A.have helped
B.Helped
C.had helped
D.was helped
The hardware makers ______.
A．have obtained enormous profits from the operation
B．have invested heavily on the research of new products
C．have helped doctors and hospitals gain more experience
D．have successfully proved the effectiveness of their products
A．have helped solve the problem of such high death rate
B．have oddly accounted for mortality rates in the past century
C．have reduced mortality rates for violent and accidental deaths
D．have achieved no effect in bringing down the number of deaths
A．have achieved no effect in reducing the number of deaths
B．have helped to solve the problem of so high death rate
C．have oddly accounted for mortality rates in the past century
D．have reduced mortality rates for violent and accidental deaths
【C5】______
A．support
B．help
C．foundation
D．maintain
