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
考查時態(tài)及語態(tài)。句意：停止，你根本不能觸摸這臺機器當(dāng)它正在被操作的時候，它非常的危險。根據(jù)語義機器被操作的時候應(yīng)用現(xiàn)在進行時的被動語態(tài)。故選D。
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