单项选择题
(Advertising) gives useful information about (which) (products) to (buying).
A．Advertising
B．which
C．products
D．buying
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单项选择题
Pierre often makes himself ______ by gesturing with his hands.
A．to understand
B．understanding
C．to be understood
D．understood
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单项选择题
______ at Harvard, he began to write his essay.
A．Busy was as he
B．Busy as was he
C．Busy as he was
D．As was he busy
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