Before the first nonstop flight made in 1949,it necessary for all planes to land for refueling.
A. would be
B. has been
C. had been
D. would have been
Before the first nonstop flight made in 1949,itnecessary for all planes to land for refuel
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解决时间 2021-01-03 13:50
- 提问者网友：無理詩人
- 2021-01-03 01:16
最佳答案
- 五星知识达人网友：夜风逐马
- 2021-01-03 02:33
A. would beB. has been(答案→)C. had beenD. would have been解析：本题时间状语从句为一般过去时，主句的情况是在从句之前，是“过去的过去”，因此用过去完成时。
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- 1楼网友：患得患失的劫
- 2021-01-03 04:02
这个答案应该是对的
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