单项选择题


A．expensive
B．mechanical
C．flourishing
D．intensive
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单项选择题
A．keepB．retainC．maintainD．reserve
A．keep
B．retain
C．maintain
D．reserve
单项选择题
A．MoreoverB．ThereforeC．AnywayD．However
A．Moreover
B．Therefore
C．Anyway
D．However
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