12、—Why didn’t you call me yesterday?

—I tried to get in touch with you, but I kept getting a busy          and couldn’t get through.

A．remark           B．sign            C．signal           D．sound

12、C

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—Why didn’t you call me yesterday?

—I tried to get in touch with you, but I kept getting a busy          and couldn’t get through.

A．remark           B．sign            C．signal           D．sound

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