报检员

单选题It is an irrevocable letter of credit which cannot(  ).

A.Change
B.be changed
C.changing
D.changed

参考答案:B进入在线模考
句意为:这是一份不可撤销信用证,是不能更改的。 “cannot”后面的被动语态应该为“be +过去分词”的形式。

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