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【题目】Jack ___________a few discoveries in chemistry since he became a scientist.

A.is makingB.will makeC.madeD.has made

【答案】D

【解析】

句意:杰克自从成为科学家以来,在化学方面有了一些发现。

考查时态。is making现在进行时;will make一般将来时;made一般过去时;has made现在完成时;根据“since he became a scientist”,所以此处用现在完成时,故选D

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