单项选择题

______ enough time and money, the researchers would have been able to discover more in this field.

A．Giving
B．To give
C．Given
D．Being given
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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
单项选择题
The student ______ his head when he couldn't answer the question.
A．scrubbed
B．scraped
C．scratched
D．scorched
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