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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单项选择题
The compulsory courses refer to those that you have to take.()

A.simple
B. voluntary
C. practical
D. required
单项选择题
She finally abandoned her original method and took a new approach().

A.supported
B. promoted
C. gave up
D. tired of
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