_______ all your time on this problem is not suita

_______ all your time on this problem is not suitable. A、SpendingB、To spendC、Spe

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You’d better ______ to see the doctor.A、goingB、goe

You’d better ______ to see the doctor.A、goingB、goesC、go toD、go

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调制解调器的作用是____。A、控制并协调计算机和电话网的连接B、负责接通与电信局线路的连接C、将模

调制解调器的作用是____。A、控制并协调计算机和电话网的连接B、负责接通与电信局线路的连接C、将模拟信号转换成数字信号D、实现模拟信号与数字信号相互转换

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