A good deal of research is being carried out nowadays （） the cause of juvenile crime.It is obvious that one of these is an unsatisfactory home background.

I should like to （）to the theater with you yesterday，but I didnt have time.

A.go
B.have
C.going
D.be

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The Contractor shall provide on the site in connection with the execution and completion of the Works and the remedying of any defects(). Only such technical assistants are skilled and experienced() their respective callings and such foreman and leading hand. 点击查看答案