单项选择题

When he was a boy, Mark Twain dreamed of traveling on river boats to ______.

A．become a riverboat pilot
B．gather material for his books
C．make money
D．enjoy himself
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单项选择题
Which one of these sentences is NOT true
A．Twain was successful in writing at last.
B．Twain was a famous humorist.
C．Twain's writing style was easy to be understood.
D．Twain wrote many poems about Mississippi.
单项选择题
It was recommended that they ______ for the doctor.
A．has waited
B．waited
C．should wait
D．should have waited
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