单项选择题

His oral English was so poor that he fond it impossible to make himself ______.

A．understand
B．understood
C．to understand
D．understanding
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单项选择题
Not until yesterday ______ anything about the project that will be completed soon.
A．did I learn
B．have I learnt
C．I learnt
D．that I learnt
单项选择题
If you can t solve this problem, why not try ______ help
A．to ask for
B．asking for
C．to ask
D．asking
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