单选题 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.
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

【正确答案】 A

【答案解析】[解析] 本句横线处表达的意思是：在何种情况下它举起它的后腿。in which case指代的是前面句中所述情况，无需倒装，因此本题答案为A。