—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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—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 |