单项选择题

_________ I would like to thank Professor Osterhaus for offering me the chance to do this study, and for all the support throughout the study period.

A．In the beginning
B．At first
C．To begin with
D．To start
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单项选择题
The hero of the book, Charles, is a conventional nineteenth-century gentleman; the heroine Sarah, _________ by her lover, is a “fallen woman”, whom Charles tries to help.
A．to be discarded
B．to have been abandoned
C．having cast away
D．having been deserted
单项选择题
The nursing staff are exhausted; they've been _________ all weekend.
A．on call
B．on guard
C． on line
D．on patrol
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