【題目】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:杰克自從成為科學(xué)家以來(lái),在化學(xué)方面有了一些發(fā)現(xiàn)。

考查時(shí)態(tài)。is making現(xiàn)在進(jìn)行時(shí);will make一般將來(lái)時(shí);made一般過(guò)去時(shí);has made現(xiàn)在完成時(shí);根據(jù)“since he became a scientist”,所以此處用現(xiàn)在完成時(shí),故選D。

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