—Jim, do you know the reason _____ Bob kept silent during the discussion?
—I guess he was thinking about his sick dog. It might be dying.
A.why | B.what | C.where | D.which |
—Jim, do you know the reason _____ Bob kept silent during the discussion?
—I guess he was thinking about his sick dog. It might be dying.
A.why | B.what | C.where | D.which |