Walking in space sound easy, yet great care and skills are required.A. mayB. shallC. shoul

发布时间：2020-08-16 10:50:10


Walking in space     sound easy, yet great care and skills are required.
A. may
B. shall
C. should
D. must

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(答案→)A. may
B. shall
C. should
D. must
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