：判断句子的类型。‎Some subjects, such as physics and biology, are very difficult to learn.‎‎A: 简单句B: 复杂句C: 并列句D: 并列复杂句答案: 简单句7、

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：​判断句子的类型。‎Some subjects, such as physics and biology, are very difficult to learn.‎​‎A: 简单句B: 复杂句C: 并列句D: 并列复杂句答案: 简单句7、