单选题
Professor Ellis is said _____ some significant advance in his research in recent years.无
A、
to have made
B、
having made
C、
making
D、
to make
【正确答案】
A
【答案解析】
句意： 据说艾利斯教授近几年在研究上取得了重要的进展。 be said to...据说……。in recent years表明要用现在完成时。
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