单项选择题

By the time I return, you ______ this book.

A．would finish
B．should have finished
C．would have finished
D．will be finished
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单项选择题
______ his work, he would do it till it was finished.
A．Once Tom would start
B．Once Tom started
C．Since Tom would start
D．Since Tom started
单项选择题
The children ______ many times not to go near the river.
A．were being told
B．have been told
C．had been told
D．told
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