—You seem to have known Dr. Ken for a long time.—That’s true. ________ he joined

题干

—You seem to have known Dr. Ken for a long time.
—That’s true. ________ he joined our club years ago.

A．Since

B．Until

C．When

D．If

上一题下一题 0.85难度单项选择更新时间:2010-07-28 01:19:37

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