单项选择题

单项选择题 I began to learn English （）I was five.

A、when
B、since
C、if

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单项选择题
Jane hasn't finished her homework and I haven't finished mine, （）

A、either
B、neither
C、too
单项选择题
My uncle is over forty but he hasn't got any children （）

A、still
B、yet
C、already
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