单项选择题
Programmed instruction received its major impetus from the work of behaviorist J. H. Skinner, who after years of research,______ a practical system in 1954.
A.described
B.derived
C.imitated
D.devised
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单项选择题
After discussing the matter with the bank manager, Peter ______received his loan.
A.instantly
B.instinctively
C.casually
D.unexpectedly
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单项选择题
Slowly, without trying to defend himself, the buffalo sank to his knees and, with one lion______ his throat and another his muzzle, died of suffocation.
A.hold
B.held
C.holding
D.being held
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