单项选择题


A．valueless
B．valuable
C．useful
D．helpful
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单项选择题
A．FortunatelyB．UnfortunatelyC．ImmediatelyD．Naturally
A．Fortunately
B．Unfortunately
C．Immediately
D．Naturally
单项选择题
A．examinationB．discussionC．explanationD．delay
A．examination
B．discussion
C．explanation
D．delay
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