题目内容
—I'm not sure ________. Do you know?
—In 1876, I think.
A.when the telephone was invented B.when was the telephone invented
C.when did the telephone invent D.when the telephone invented
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题目内容
—I'm not sure ________. Do you know?
—In 1876, I think.
A.when the telephone was invented B.when was the telephone invented
C.when did the telephone invent D.when the telephone invented