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he _in a small shop,but now he is president of big business

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he _in a small shop,but now he is president of big business company A used to working
he _in a small shop,but now he is president of big business company A used to working Bwas used to work Cused to work D was used to working答案是C为什莫不是B过去常常.如果选C那谓语呢
e used to do sth.是use的被动语态结构,“被用来做某事”.如:
The bamboo is used to make chairs.
be used to (doing) sth是“习惯于做某事”,to是介词,后面接名词或动名词.如:
She is used to the new life here.
She is used to getting up early evey morning.
used to do sth.是“(过去)常常做某事”,如:
I used to swim in a small river in my hometown.
used to do sth的否定形式和疑问形式有两种.以上题为例:
否定句:I usedn't to swim in a small river in my hometown.
I didn't use to swim in a small river in my hometown.
一般疑问句:Used you to swim in a small river in my hometown?(肯定回答:Yes,I used to.否定回答:No,I usedn't (to).)
Did you use to swim in a small river in my hometown?(肯定回答:Yes,I did.否定回答:No,I didn't.)
题目“他过去在一家小店工作”,选C.