This semester, the courses Williams has taken are History, Mathematics, Chemistry and Physics, Mathematics ______ the most impor

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问题 This semester, the courses Williams has taken are History, Mathematics, Chemistry and Physics, Mathematics ______ the most important.

选项 A、is
B、being
C、has been
D、of

答案B

解析本句是分词独立结构。一旦分词的逻辑主语不是主句中的主语，就必须给分词加上逻辑主语(即分词独立结构)。

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