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Training astronauts ______ not an easy thing.A、areB、isC、wereD、beB此题考查主谓一致。动名
Training astronauts ______ not an easy thing.A、areB、isC、wereD、beB此题考查主谓一致。动名
游客
2023-09-25
51
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
此题考查主谓一致。动名词短语做主语,谓语用单数。
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