The touch excites no defensive response unless the approach is from above where the spider can see the motion, ______on its hind

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问题 The touch excites no defensive response unless the approach is from above where the spider can see the motion, ______on its hind legs, lifts its front legs, opens its fangs and holds this threatening posture as long as the object continues to move.

选项 A、in which case it rises
B、in that case it rises
C、in which case does it rise
D、such being the case it rises

答案A

解析 根据空格处的意思“在何种情况下它举起它的后腿”,可知in which case是对前面情况的指代,不引起倒装,故选A。
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