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—Whoisthemanbyagroupofstudentsthere?—Aprofessorresearchonphysics.A.followed;didB.following;didC.followed;doingD.following;doing

题目详情
—Who is the man ______ by a group of students there?
—A professor _____ research on physics.
A.followed; did B.following; did
C.followed; doing D.following; doing
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答案和解析
C