57._________A..closedB. closingC. closeD. has clo

When start a screw pump, the by pass valve should be ____.A.closedB.opened fullyC.cracked

A．closedB．closingC．closeD．has closed

The road is _______ to traffic due to construction.A: closedB: closeC: closingD: close

One day a poor man ____ his horse to a tree, and sat down to eat his lunch.A、closedB、

Thousands of workers in the small town are______since the car factory has closed down.A．id

The world has never been more closely and intricately connected. Our behavior【C1】______the