For our middle school students, some courses are compulsory, while others are ______.

A. flexible
B. optional
C. impressive
D. significant
B
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科目：高中英語 來源：江蘇省2012屆度高三上期初調(diào)研測試（英語） 題型：單項(xiàng)填空

For our middle school students, some courses are compulsory, while others are ________.

A. flexible     B. optional         C. impressive           D. significant

 

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科目：高中英語 來源：專項(xiàng)題 題型：單選題

For our middle school students, some courses are compulsory, while others are ______.
[      ]
A. flexible
B. optional
C. impressive
D. significant

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