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【单选题】
当边际效用MU>0,则随着消费数量的增加,总效用TU( )A.
达到最大值
B.
增加
C.
保持不变
D.
减少
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举一反三
【简答题】He was just about to get into his car when he saw a girl come ______ (run) across the street toward him.
【简答题】证券公司公开发行的债券，在债券销售期内售出的债券面值总额占拟发行债券面值总额的比例不足（ ）的，或者未能满足债券上市条件的，视为发行失败。
【简答题】证券公司公开发行的债券，在债券销售期内售出的债券面值总额占拟发行债券面值总额的比例不足（ ）的，或者未能满足债券上市条件的，视为发行失败。
【单选题】It's 2:20 and he said he'd be here at 2:30 . He ______ be here soon.
A.
should
B.
can
C.
would
D.
need
【简答题】If he were to come here, he ______ (tell) us the details about this matter.
【单选题】By the time he arrives in Beijing, we _____ here for two days.
A.
will have stayed
B.
shall stay
C.
have been staying
D.
have stayed
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