单项选择题

Johnson cannot but __________ his tutor for supervising him to solve the difficulty he has in doing his project.

A．to turn to
B．turn to
C．turning to
D．turned to
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单项选择题
The investment in the stocks is very risky. But _________ , we would be wealthy.
A．should we succeed
B．would we succeed
C．might we succeed
D．could we succeed
单项选择题
The problem was so tough that the pupils did not know how to __________ it.
A．abolish
B．encounter
C．remove
D．tackle
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