___________[A] when[B] once[C] while[D] whereas

___________

[A] when

[B] once

[C] while

[D] whereas


相关考题:

It has been over a century _______ the railway was completed. (A)when(B) once(C) which(D) since

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___________A] when[B] since[C] for[D] whereas

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