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【单选题】
下列项目中不应征收增值税的是( )。A.
古旧图书
B.
将产品赠与他人
C.
以物易物
D.
没收逾期未收回的包装物押金
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】A new technique_________, the yields as a whole increased by 20 percent.
A.
working out
B.
having worked out
C.
having been worked out
D.
to have been worked out
【单选题】People appreciate _____ with him because he has a good sense of humor. A. working B. to work C. to have worked D. having worked
A.
working
B.
to work
C.
to have worked
D.
having worked
【单选题】1 spent half an hour _________ this difficult math problem.
A.
having worked on
B.
to work on
C.
on work
D.
working on
【单选题】all day, I went to bed early.
A.
Working hard
B.
Worked hard
C.
Having worked hard
D.
To work hard
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