四六级考试

【单选题】 Professor Johnson is said__________some significant advance in his research in the past year.
A．having made
B．making
C．to have made
D．to make

网考网参考答案：C
网考网解析：
[解析]考点：语法结构。由于Professor Johnson去年的研究取得重大进展先于“据说”之前，故应用不定式完成式。故D不对。be said to do/have done/be为常用结构。 [译文]据说，去年约翰逊教授的研究取得了重大进展。 查看试题解析出处>>