单项选择题

In vain ______ to get in touch with the Embassy.

A．they tried
B．tried they
C．did they try
D．they have tried
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单项选择题
The student ______ his head when he couldn't answer the question.
A．scrubbed
B．scraped
C．scratched
D．scorched
单项选择题
His strong sense of humor was ______ make everyone in the room burst out laughing.
A．so as to
B．such as to
C．so that
D．such that
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