单项选择题

After several fruitless attempts, the new approach ___________ the tough problem was considered as the last resort.

A．to solve
B．with solving
C．to solving
D．for solving
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单项选择题
It was rather clear that Mr. Christopher didn't want to tell them the truth, and he _______________ made his answer vague.
A．deliberately
B．enthusiastically
C．sincerely
D．habitually
单项选择题
Mary doesn't like to talk_____________.
A．at the table
B．at tables
C．at table
D．at a table
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