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  3. Some subjects are compulsory for the students,but some are optional.（）A.difficuI

Some subjects are compulsory for the students,but some are optional.（）A.difficuI

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问题 Some subjects are compulsory for the students,but some are optional.（）
选项 A.difficuIt
B.elective
C.beneficial
D.profitable
答案B
解析逻辑关系,语义原则.
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