单项选择题

--Mark broke his leg when he was playing football.
-- () was that

A.Since when
B.Since when ago
C.How long
D.How long ago

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单项选择题
--I really don't know how to thank you enough.()

A.No problem
B.Think nothing of it
C.Not at all
D.It doesn't matter
单项选择题
He has made another discovery, () of great importance to science.

A.which I think it is
B.of which I think it is
C.which I think is
D.I think which is
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