There are five pairs________,but I am at a loss which to buy

There are five pairs________,but I am at a loss which to buy There are five pairs ,but I am at a loss which to buy.A.to b There are five pairs ( ),but l am at a loss which to buy. there are five pairs ___,but I'm at a loss which to buy. There are five pairs___, but I'm at a loss which to buy. 答案是 1.There are five pairs ______,but I'm at a loss which to buy 1、There are five pairs ____,but I'm at a loss which to buy. there are five pairs to choose from,but i am at a loss which 1.there are five pairs ______ ,but i am at a loss which to b ,but I am at a loss which to buy 不定式做定语There are five pairs ______,but I’m at a loss which to There are 5 pairs ___,but I'm at a loss which to buy.