题目内容
At the railway station,he waved goodbye to his friend until the train was ________.
| A.out of sight |
| B.out of reach |
| C.out of order |
| D.out of place |
A
句意为:在火车站,他挥手同他的朋友告别直到火车看不见了。out of sight看不见,符合题意。
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