many books____（send）to school since then为什么不写have been sent,而写had been sent

many books____（send）to school since then为什么不写have been sent,而写had been sent These books____（卖）very well.Go and buy one before they're_____（卖）out. 把emails,do,you,many,how,day,every,send（连词成句） 做个题.Today,many people use the computer ——（send） e-mails. How many postcards___you___(send)every year? The books____ on the table. send send many,you,send,how,emails,do连词成句 how many emails do you send in a week? one day pls send me one copy by txt,many many thanks send a postcard(中文） Thanks for ______me so many books.单项选择Thanks for ______me so many books.a)send b)to send c)sending d)sends let's sell books____ _____ (改为反意疑问句) many people send (postcard)to each other on New Year's Day明信片加s吗? many emails do send you every how day连词成句陈述句 So far,man-made satellites_____(send)up into space by many countries. How many stamps should I stick when I want to send you our card?十万火急!