单项选择题

The professor spoke very clearly to make himself ______.

A．to understand
B．understood
C．understanding
D．understand
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单项选择题
Keep away from such things _______ will do you harm.
A．that
B．which
C．who
D．as
单项选择题
He ______ there for half an hour. Let's hurry!
A．has been waiting
B．has waiting
C．was waiting
D．have waited
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