单项选择题

Professor McDonald's______ knowledge on this subject resulted in his authority in this academic field.

A．extensive
B．excessive
C．expensive
D．intensive
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单项选择题
The captain of the ship______ the passengers that there was no danger.
A．ensured
B．insured
C．assured
D．assumed
单项选择题
The bus that______ outside the inn would. soon take the visitors downtown.
A．held back
B．set forth
C．got down
D．pulled up
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