单项选择题


A．which
B．that
C．how
D．why
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单项选择题
A．take painsB．run riskC．take a riskD．make efforts
A．take pains
B．run risk
C．take a risk
D．make efforts
单项选择题
A．willingB．reluctantC．unwillingD．probable
A．willing
B．reluctant
C．unwilling
D．probable
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