We use the _____ to go up and down the tall building.空内应填elevator还是elevators?
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We use the _____ to go up and down the tall building.空内应填elevator还是elevators?
We use the _____ to go up and down the tall building.空内应填elevator还是elevators?
We use the _____ to go up and down the tall building.空内应填elevator还是elevators?
前面有THE 用elevator 特指
elevator.电梯,这里强调的是工具,并不是数量