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单选题
We must grease and clean the derrick parts.（）
A
我们必须给吊杆部件上大黄油并清洗。
B
我们必须马上给吊杆部件上大黄油并清洗。
C
我们应该给吊杆上大黄油并清洗。
D
我们不用给吊杆部件上大黄油并清洗。
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