单选题If the engine () for a long period, there will be a danger of frost.Amust to stand inoperativeBhas to stand inoperativeCmust be stood idleDwill stand idle

单选题
If the engine () for a long period, there will be a danger of frost.
A

must to stand inoperative

B

has to stand inoperative

C

must be stood idle

D

will stand idle


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