单项选择题

If you want to do well on the exam, you ______ on the directions that the professor gives and take exact notes.

A．will have concentrated
B．have to concentrate
C．will be concentrated
D．will be concentrating
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单项选择题
Britain hopes of a gold medal in the Olympic Games suffered ______ yesterday, when Hunter failed to qualify during preliminary session.
A．a severe set-back
B．sharp set-back
C．a severe blown-up
D．sharp blown-up
单项选择题
All of the international delegates attending the conference ______ to bring a souvenir from their own countries.
A．has asked
B．is asking
C．were asked
D．was asking
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