单项选择题

— Mum, what's happened—（） a fire in town.

A.It's been
B.It's
C.There's been

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单项选择题
I think the book on light music is worth （）

A.reading
B.to read
C.to be read
单项选择题
I said nothing, （）I had no idea about it.

A.before
B.though
C.as
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