单项选择题

（）is known to the world, Mark Twain is a great American writer.

A、 That
B、 It
C、 Which
D、 As

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单项选择题
It was（）he was ill that he did not go to Mount Tai with us in our summer vocation.

A、 because
B、 as
C、 since
D、 though
单项选择题
Mary was picked（）from thousands of applicants for a teaching job.

A、 up
B、 off
C、 out
D、 in
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