单项选择题

A．If
B．Although
C．Whereas
D．Because
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单项选择题
A．strengthenedB．accommodatedC．stimulatedD．enhanced
A．strengthened
B．accommodated
C．stimulated
D．enhanced
单项选择题
A．On the contraryB．On the averageC．On the wholeD．On the other hand
A．On the contrary
B．On the average
C．On the whole
D．On the other hand
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