来自齐同军的问题
Britishpeoplesay"please"and"thankyou"allthetime_______somepeopleinAsiamaythinkitunnecessary．（）A.whileB.whenC.untilD.since
British people say"please"and"thank you"all the time _______some people in Asia may think it unnecessary．（）
A.while
B.when
C.until
D.since
