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Training astronauts______not an easy thing.A、areB、isC、wereD、beB当分词短语作主语时,谓语动
Training astronauts______not an easy thing.A、areB、isC、wereD、beB当分词短语作主语时,谓语动
游客
2023-09-21
47
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
当分词短语作主语时,谓语动词用单数,故选B。
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