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。
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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