单项选择题

Despite scholars’study，the （）of human beings is still unclear.

A.origin
B.cause
C.begin
D.initiate

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单项选择题

But for your help，we （）the work as scheduled.

A.could not finish
B.would not have finished
C.would have finished
D.could have finished

单项选择题

His mind was （）on one thing：How to win the game.

A.concentrated
B.observed
C.indicated
D.declared