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职称英语
Training astronauts- ______ not an easy thing.A、areB、isC、wereD、beB句意:训练宇航员可不
Training astronauts- ______ not an easy thing.A、areB、isC、wereD、beB句意:训练宇航员可不
游客
2023-09-26
55
管理
问题
Training astronauts- ______ not an easy thing.
选项
A、are
B、is
C、were
D、be
答案
B
解析
句意:训练宇航员可不是件容易的事。该题考查的是主谓一致。当主语是个抽象的概念时谓语动词用单数。
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