单项选择题

He tried to avoid the barrier to his carrying out the plan().

A.root
B. obstacle
C. danger
D. advantage

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单项选择题
The behavior is stemmed from his ide()

A. flows
B. comes
C. watches
D. observe
单项选择题
He expressed concern that the ship might be in danger().

A.worry
B. difficulties
C. need
D. danger
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