单项选择题

If I hadn't given you a hand in time of crisis, you ______ on air now.

[A] couldn't have put
[B] wouldn't be putting
[C] didn't put
[D] won't put
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单项选择题
Physics is the present day equivalent of ______ used to be called natural philosophy, from most of present day science arose.
[A] which, what
[B] that, which
[C] what, which
[D] what, that
单项选择题
When the boy came back years later, he found the empty old house there.
[A] none but
[B] none other than
[C] nothing but
[D] no other than
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