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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