单项选择题

Not until ______ himself seriously ill.

A．he had completed the task did he find
B．had he completed the task did he find
C．he completed the task had he found
D．did he complete the task he had found

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单项选择题

The ______ crown jewels are kept in the Tower of London.

A．valued
B．valueless
C．invaluable
D．worthy

单项选择题

I hope you ______ all the material before you make the final decision.

A．will have read
B．will read
C．will be reading
D．would have read