单项选择题

The behavior is stemmed from his ide()

A. flows
B. comes
C. watches
D. observe

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单项选择题
He expressed concern that the ship might be in danger().

A.worry
B. difficulties
C. need
D. danger
单项选择题
The compulsory courses refer to those that you have to take.()

A.simple
B. voluntary
C. practical
D. required
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