Question

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

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

Answer 1

【答案】D

【解析】

句意：杰克自從成為科學(xué)家以來，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一般將來時(shí)；made一般過去時(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。