题目内容

Stop! You can never touch this machine when it ________, it is very dangerous.
A．has been operatedB．will be operated C．is operated D．is being operated
D
考查时态及语态。句意：停止，你根本不能触摸这台机器当它正在被操作的时候，它非常的危险。根据语义机器被操作的时候应用现在进行时的被动语态。故选D。
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