四六级考试

【单选题】 Contrast may make something appear more beautiful than it is when ______ alone.
A．seen
B．is seen
C．to be seen
D．having been seen

网考网参考答案：A
网考网解析：
当从句主语和主句主语相同，而且从句谓语动词是be的形式时，可以将从句主语和be的形式省 略，例如：Every one is blind when maddened by love．一旦被爱情冲昏头脑，人便盲目无主。The tree of liberty grows only when watered by the blood of tyrants．自由之树只有用暴君的血来浇灌才能生长。 查看试题解析出处>>