明天月考= =.急救啊.The police had a hard time _____the thieves,but they didn't take great trouble____theri head.A.to catch,catching B catching,to catchC in catching ,in catching D to catch,in catching为什么选B不能选A

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明天月考==.急救啊.Thepolicehadahardtime_____thethieves,buttheydidn''ttakegreattrouble____therihead.A.tocatch

明天月考= =.急救啊.The police had a hard time _____the thieves,but they didn't take great trouble____theri head.A.to catch,catching B catching,to catchC in catching ,in catching D to catch,in catching为什么选B不能选A
明天月考= =.急救啊.
The police had a hard time _____the thieves,but they didn't take great trouble____theri head.
A.to catch,catching B catching,to catch
C in catching ,in catching D to catch,in catching
为什么选B不能选A

明天月考= =.急救啊.The police had a hard time _____the thieves,but they didn't take great trouble____theri head.A.to catch,catching B catching,to catchC in catching ,in catching D to catch,in catching为什么选B不能选A
catching动名词可以指持续的过程,to catch是一时的动作.这句话的意思是说,警察为了抓这些贼花了大量的时间,但是抓捕的时候并没太费劲