测土配方施肥技术的核心是调节和解决作物需肥与土壤供肥之间的矛盾。
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The three men tried many times to sneak across the border inthe the neighboring coutry_________ by the police each time.
A. had been captured
B. being always captured
C. only to be captured
D. unfortunately captured
Professor Johnson is believed ______ some significant advance in his research in the past year.
A. having made
B. making
C. to have made
D. to make
Even as a girl,_________ to be her life, and theater audience were to be her teachers.
A. performing by Melissa were
B. it was known that Melissa's performances were
C. knowing that Melissa's performances were
D. Melissa knew that performing was
Here are the first two volumes, the third one was_____ next month.
A. to come out
B. coming out
C. will come out
D. having come out