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【单选题】
下列化合物中α-H的酸性最强的是A.
CH 3 CO 2 CH 3
B.
CH 3 COCl
C.
CH 3 CHO
D.
CH 3 COCH 3
E.
NCCH 2 CN
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举一反三
【单选题】My mother hasn’t been to Beijing , my father .
A.
so ; has
B.
neither ; hasn’t
C.
nor ; hasn’t
D.
but ; has
【简答题】A．To work for a travel agency. B．To find a job in the physics field. C．She hasn't decided. D．To work in the IT industry.
【单选题】It ____________ whether he will go on with his study at the university.
A.
hasn't been decided
B.
isn't decided
C.
hasn't decided
D.
doesn't decide
【单选题】------ Smith hasn't come back, hasn't he ? ------ ______. He will return next week.
A.
Yes, he has
B.
Yes, he hasn't
C.
No, he hasn't
D.
No, he has
【单选题】There has been a positive response to the export promotion, ______? ( )
A.
hasn't it
B.
hasn't there
C.
doesn't it
D.
has there
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