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【单选题】
下列不属于信用证应具备的要素的是( )。A.
开证行承付的前提条件是相符交单
B.
信用证应当是开证行开出的确定承诺文件
C.
信用证应贯彻独立和分离的原则
D.
开证行的承付承诺不可撤销
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【单选题】听力原文：W: You look like your father than your mother. M: I prefer to look like my mother. What does the man mean?
A.
He thinks his mother looks better than his father does.
B.
He thinks his father looks better than his mother does.
C.
He loves his mother more than his father.
【单选题】I want to buy a piano of high quality, _____ I can practise on every afternoon.
A.
that
B.
so that
C.
what
D.
one
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