It is necessary that everything ________ ready by 6: 00 p.m.

单选题

It is necessary that he ____there at once.

答案解析

单选题

It is necessary that everything ________ ready by 6: 00 p.m.

答案解析

单选题

In designing schematic diagrams, it may be necessary to compromise between detail that is necessary to make the diagram self-explanatory, and simplicity that is essential for ease of reading and understanding.

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单选题

It is possible that local fire codes, and standards make it necessary to use more restrictive procedures than those given in the subsequent steps.

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判断题

It is necessary for elderly people to make friends

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