单项选择题

Although he was ill, () he went on working.

A.but
B.yet
C.and
D.while

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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
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
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