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题目内容
（陇东学院-大学英语1(专升本)）
27. (单选题) It is desirable that the airplane ___________ as light as possible.(本题2.5分)
A、 is
B、 were
C、 be
D、 had been
A、 is
B、 were
C、 be
D、 had been
参考答案
