问题

It is essential that the glass ______ thicker on the outside than on the inside and that t

It is essential that the glass ______ thicker on the outside than on the inside and that the gap between the panes of glass______ a minimum of 7 centimeters.

A．is, is

B．be, is

C．be, be

D．is, be

请帮忙给出正确答案和分析，谢谢！

参考答案

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