Writers can accurately describe objects ______ have never seen.
A. who
B. if they
C. they
D. that
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I’ve got a bottle of beer, but I haven’t got anything _____ I can open it with.
A. that
B. what
C. where
D. which
er career.
A. that
B. so that
C. so
D. which
脊休克的休克期表现是怎样的?其产生和恢复说明了什么?
1981年4月12日,什么型号的航天飞机实现了人类第一架可重复使用、往返近地轨道之间的首航成功?