单项选择题

A．The woman knows the professor has been busy.
B．The woman regrets having taken up much of the professor’s time.
C．The woman has trouble getting along with the professor.
D．The woman knows the professor has run into trouble.
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单项选择题
A．It has been increasing since the Ice Age.B．It affected the growth of trees.C．It is determinated by the chemicals in the air.D．It follows a certain cycle.
A．It has been increasing since the Ice Age.
B．It affected the growth of trees.
C．It is determinated by the chemicals in the air.
D．It follows a certain cycle.
单项选择题
A．Government officers are hard to please.B．The learner has to go through several tough tests.C．The learner usually fails several times before he passes it.D．The driving test usually lasts two months.
A．Government officers are hard to please.
B．The learner has to go through several tough tests.
C．The learner usually fails several times before he passes it.
D．The driving test usually lasts two months.
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