单项选择题

All the key words in the article are printed in______ type so as to attract readers'' attention.

A．dark
B．dense
C．black
D．bold
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单项选择题
We are all for your proposal that the discussion______.
A．be put off
B．was put off
C．should put off
D．is to put off
单项选择题
It is important that the hotel receptionist ______ that guests are registered correctly.
A．has made sure
B．made sure
C．must make sure
D．make sure
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