单项选择题

The professor found himself constantly ______ the question: "How could anyone do these things"

A．poring
B．pondering
C．presiding
D．presuming
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单项选择题
Professor Smith and Professor Brown will ______ in presenting the series of lectures on American literature.
A．alter
B．alternate
C．substitute
D．exchange
单项选择题
After a meal in a restaurant, you ask the waiter for the______.
A．bill
B．note
C．receipt
D．menu
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