.The bus hasn’t yet although it should have arrived here half an hour ago.A. turned onB.

问题补充：

.

The bus hasn’t yet, although it should have arrived here half an hour ago.

A. turned on

B. turned off

C. turned up

D. turned down

答案：

A. turned on

B. turned off

(答案→)C. turned up

D. turned down

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