4. As a public relations officer, he is said ________ some very influential people.
A.toknowB.tohavebeenknowingC.tobeknowingD.tohaveknown...
A. to know
B. to have been knowing
C. to be knowing
D. to have known 展开
B. to have been knowing
C. to be knowing
D. to have known 展开
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