皮皮学，免费搜题
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【单选题】
经济学意义上的创新,作为一种人类行为,其主体是()A.
企业家
B.
发明家
C.
科学家
D.
经济学家
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】_______ did he tell his wife ________ he wished to do
A.
That...what
B.
What...that
C.
Where...which
D.
Which...where
【单选题】What did Jackson worry about greatly after his wife died?
A.
The American Revolution.
B.
His health.
C.
His family.
D.
His soldiers.