It is said that a reliable treatment for the disease will be

It is said that a reliable treatment for the disease will be applied at least two or three months away and still it ______on animals.
A.is testing B.has tested C.is being tested D.has been tested
楼主有病 1年前 已收到1个回答 举报

高胡哪一族 幼苗

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C


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