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

游客2024-10-11  11

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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