A-A+ Professor Johnson is said ______ some signific 2022-08-05 17:46:06 问答库 阅读 170 次 问题详情 Professor Johnson is said ______ some significant advance in his research in the past year.A．having madeB．makingC．to have madeD．to make 参考答案 正确答案：C解析：用不定式的完成时表示过去意义。
