to buy
buying
bought
buy
第1题：
A.buy
B.take
C.book
D.create
第2题：
—What made her so upset?
—______the necklace ______yesterday.
A. Lost, bought
B. Lost, buying
C. Losing, having bought
D. Losing, bought
第3题：
Which is not one of the five classifications of work found in a purchasing operafion?
A Management
B Buying
C Follow-up and expediting
D Marketing
E Clerical
第4题：
Where are you used to()vegetables?
A. buy
B. bought
C. buying
答案：C
解析：本题的答案要点是 ： be used to do / be used to doing 的运用。
A选项： be used to do【are used to buy】 是被动式，是指被用来做什么。
本题目中如果选择 buy Where are you used to buy vegetables?
这句话的意思是“你被用作去哪买菜“
B选项：bought 是buy 的过去式，本句不能用过去式。
C选项：be used to doing【are used to buying】 是指习惯做某事。
1、doing 作为名词，意思是发生的事，所做的事
2、doing 作为动词，意思是做；干；【也就是本题中的buying】是do的现在分词
3、doing 作为动名词。用法比较复杂。分下列几种：
【1】作为主语。谓语用单数。It代替动名词作主语。一般用于此结构It's no good/use doing
【2】作为宾语。有些动词只能接动名词作为宾语，如： admit，advise，consider，stick to， be used to，object to等等,这里部分举例。
【3】作状语。现在分词可以在句中作时间、原因、伴随、条件、结果等状语。
【4】作定语。表示用途的时候一般做定语。
【5】作表语。和主语调换位置了位置的动名词在句中的成分作为表语。
【6】作宾语补足语。有时会做 带有复合宾语的动词 的宾语补足语。如：see, watch, hear,observe, feel, find, have, keep等等
本题中buying作为动名词，作介词 are used to 的宾语。 组合成are used to buying， 意思是习惯买东西
本题目中选择 buying Where are you used to buying vegetables
这句话的意思是“你习惯去哪里买蔬菜”.
和本题相关的知识点都已经讲清楚。本题主要涉及到的知识点就是 be used to dong.
第5题：
A、needs buy
B、need to buy
C、need buy
D、need
第6题：
46．There are so many kinds of MP5 in the shop． We can-t decide _________ ．
A． what to buy
B． to buy what
C． which to buy
D． to buy which
第7题：
I _____a flat if I won the lottery.
A. would buy
B. will buy
C. buy
第8题：
191 Which is not one of the five classifications of work found in a purchasing operafion?
A. Management
B. Buying
C. Follow-up and expediting
D. Marketing
E. Clerical
第9题：
Would you like ______some vegetable?
A、buy
B、to buy
C、buying
D、bought
第10题：
Charles regretted()the TV set last year.The price has now come down.
A. to buy
B. buying
C. of