单项选择题

Professor Wang, （）for his informative lectures, was warmly received by his students.

A．knowing
B．known
C．to be known
D．having known

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单项选择题
In Africa, educational costs are very low for those who arc （） enough to get into universities.

A．ambitious
B．fortunate
C．aggressive
D．substantial
单项选择题
They always give the vacant seats to （） comes first.

A．whoever
B．whomever
C．who
D．whom
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