单项选择题

It seems oil ______ from this pipe for some time. We'll have to take the machine apart to put it right.

[A] had leaked
[B] is leaking
[C] leaked
[D] has been leaking
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单项选择题
The world's governments have done ______ nothing to combat the threat of nuclear accidents.
[A] inherently
[B] vitally
[C] virtually
[D] identically
单项选择题
For a long while he waited, not daring to descend from his hiding place ______ they should come out and catch him in the act.
[A] when
[B] lest
[C] that
[D] where
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