单项选择题

A．Spend more time in the library.
B．Write just one paper for all his classes.
C．Drop one of his courses.
D．Do his research on closely related topics.
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单项选择题
A．One may be doing something quite difficult.B．One may be doing something quite risky.C．One may be doing something quite annoying.D．One may be doing something impossible.
A．One may be doing something quite difficult.
B．One may be doing something quite risky.
C．One may be doing something quite annoying.
D．One may be doing something impossible.
单项选择题
A．An interesting piece of wood.B．An old shoe.C．A message inside a bottle.D．An unusual shell.
A．An interesting piece of wood.
B．An old shoe.
C．A message inside a bottle.
D．An unusual shell.
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