2. 外语
  3. A heavy box on the floor will stay in place______it is pushed or pulled.

A heavy box on the floor will stay in place______it is pushed or pulled.

admin2013-06-19  28
问题 A heavy box on the floor will stay in place______it is pushed or pulled.
选项 A、if
B、when
C、unless
D、or else
答案C
解析 状语从句。条件状语从句连词unless表示“除非，如果不”之意。D项表示“否则，要不然”，不符句意。
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