(单选题) The telephone, ______ was invented by Bell in 1876,was a great improvement on the telegraph.( )(本题1.0分) A、 when B、 which C、 that D、 who

(单选题) The telephone, ______ was invented by Bell in 1876,was a great improvement on the telegraph.( )(本题1.0分)
A、 when
B、 which
C、 that
D、 who

出自：沈阳建筑大学大学英语3

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