2. 考研
  3. You may borrow the book______you keep it clean.

You may borrow the book______you keep it clean.

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问题 You may borrow the book______you keep it clean.
选项 A、such as
B、so as to
C、so long as
D、as for
答案C
解析 such as引导出同位语，对名词起列举作用，例如：Romance languages，such asFrench and Spanish，are spoken in Latin America．罗曼语，如法语、西班牙语等，通行于拉丁美洲。so as to相当于in order to，引导的不定式用作目的状语，意为“为了，以便于”，例如：Metallic surface should be greased so as to decrease friction．金属表面必须涂上油脂，以减少摩擦。as for作“至于……，就……而言”讲，放在句首相当于“as far as…be con-cerned”，例如：As for this kind of vare metal，it will be further studied．对这种稀有金属要作进一步的研究。so long as或as long as可以引导条件状语从句，表示“只要……”，例如：As long as you keep away from him，you are safe．只要你不和他掺和在一起，你就会很安全。可见只有C适合本题。
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