It is desirable that the airplane ______ as light and fast as possible.

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问题 It is desirable that the airplane ______ as light and fast as possible.

选项 A、be made
B、is made
C、were made
D、has been made

答案A

解析在it is/was advisable/desirable/essential/important/imperative/necessary/nor-mai/preferable/vital等形容词+that结构的主语从句中，谓语动词用(should)+动词原形。

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