30. A brave passenger saw the man ____ the student and immediately called security.
(A) harassing
(B) harasses
(C) to harass
(D) being harassing
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統計: A(38), B(5), C(3), D(3), E(0) #3492363
統計: A(38), B(5), C(3), D(3), E(0) #3492363