单选题
It is desirable that the airplane ______ as light and fast as possible.
A、
be made
B、
is made
C、
were made
D、
has been made
【正确答案】
A
【答案解析】
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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