If these trousers are too short ,buy a bigger A one B pair C ones D pairs应该选什么 为什么选A能给解释下吗

do you like these trousers? Are these your trousers?Yes,these are, If these trousers are too big,buy a smaller _________ .A.set.B.one.C.piece.D.pair. Are these your trousers?怎么回答? these are my trousers(对my提问) These are (trousers)括号部分提问 These are Jim's trousers.____trousers are these? How much are these trousers(改为同义句）改为（ ）（ ）the ( )( ) these trousers these white trousers are my brothers favourite同义句转换these are --- ---- ---- white trousers If these trousers are too short ,buy a bigger A one B pair C ones D pairs应该选什么 为什么选A能给解释下吗 (D ) 1 If these trousers are too big,buy a smaller____.　　A.set B.one C.piece D.pair为什么选D不能选B求原因谢谢 If these trousers are too big,buy a smaller p _____Look at the clouds.It's c（这个单词填空） today. ( ) 1 If these trousers are too big,buy a smaller____.A.set B.one C.piece D.pair 为何不选择B trousers trousers H m are these trousers?They’re 400 yuan. These are his trousers.这只是回答,提问应该是什么? these trousers are my fathers 将my fathers提问