题目内容
21、Although everything seems to have been taken into consideration， accident can happen when the astronauts walk in space．
A．不填；the B．an；the C．the；the D．an；不填
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三、书面表达
（每空？ 分，共？ 分）
试题答案
21、D
三、书面表达
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Although everything seems to have been taken into consideration， accident can happen when the astronauts walk in space．
A．不填；the B．an；the C．the；the D．an；不填
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