单项选择题

"How long ______________ in the sun You are working too hard!"

A．have you sewn
B．did you sew
C．have you been sewing
D．are you sewing
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单项选择题
The reason why I left before the meeting ended was ________________ I was bored by the lengthy speeches.
A．that
B．because
C．because that
D．for
单项选择题
He likes fiction, ____________ I like poetry.
A．while
B．because
C．although
D．so
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