单项选择题

  There is nothing secret about what we’re doing; it’s all perfectly ______.

A.out of sight
B.on the air
C.on the horizon
D.above board
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单项选择题
The ocean bottom even today is largely unexplored: until about a century ago, the deep-ocean floor was completely ______, hidden beneath water averaging over 3, 600 meters deep.
A.inevitable
B.indefinite
C.incomparable
D.inaccessible
单项选择题
______ you can bring yourself to stop hating her, it sounds like an arrangement that could work out rather nicely.
A.So far as
B.So long as
C.As well as
D.As often as not
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