单选题Onlyinthepast50years,withtherevo
答案:2 悬赏:20 手机版
解决时间 2021-12-22 05:02
- 提问者网友：皆是孤独
- 2021-12-21 16:03
单选题
Only in the past 50 years, with the revolution in diving equipment, ________ study deep seas closely.A.were scientists able toB.have scientists been able toC.would scientists be able toD.will scientists be able to
最佳答案
- 五星知识达人网友：摆渡翁
- 2021-12-21 16:32
B
全部回答
- 1楼网友：老鼠爱大米
- 2021-12-21 16:46
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