单项选择题

The doctors and the nurses did all they could ______ the patient's life.

A．save
B．to save
C．to be saving
D．to have saved
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单项选择题
When ______ again When he ______ , I'll let you know.
A．will he come, will come
B．will he come, come
C．he comes, will come
D．will he come, comes
单项选择题
— Have you finished reading the books borrowed from the library — Yes, and I've returned them. Now ______ is left at home.
A．nothing
B．none
C．no one
D．neither
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