问题
David, turn off the TV _____ no one is watching it.—But it _____ off already! The music is from the radio.[ ]
A: so that; has been turned
B: when; has turned
C: if; has been turned
D: because; has turned
B: when; has turned
C: if; has been turned
D: because; has turned
正确答案是：
同类题型
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