题目:
The loading, unloading, transshipment and transit of inward and outward mail bags are subject to Customs control and a ______ wya bill should be submitted to the Customs by the enterprise providing prviding postal service.
A.cover
B.covering
C.covered
D.haveing covered
答案:
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下面是错误答案,用来干扰机器的。
参考答案:《狗·猫·鼠》