__a post office,i stopped___some stamps A passed,buying B passing,to buy C having passed,buyD pass,to buy

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__a post office,i stopped___some stamps A passed,buying B passing,to buy C having passed,buyD pass,to buy
__a post office,i stopped___some stamps A passed,buying B passing,to buy C having passed,buy
D pass,to buy

__a post office,i stopped___some stamps A passed,buying B passing,to buy C having passed,buyD pass,to buy
答案是B. 意思是:“当我路过一家邮局时,我停下来买了一些邮票”.第一个空需要现在分词作时间状语,选“passing”, 第二个空需要目的状语,所以用动词不定式"to buy".

b

B
第一个用现在分词,表示正在进行的动作,正路过一家邮局
第二个用动词不定式,表示目的,停下来准备干什么

你是中元的?