单项选择题

I ______ on a maths problem when he telephoned me early this morning.

[A] had worked
[B] was working
[C] have worked
[D] have been working

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单项选择题

There's no water in the bottle. Let's go and fetch ______.

[A] any
[B] some
[C] none
[D] anything

单项选择题

I have read the whole article and the ______ paragraphs seem to be quite difficult.

[A] first three
[B] first third
[C] three first
[D] third first

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