2. 外语
  3. It is essential that the glass _____ thicker on the outside than on the inside and that the gap between the panes of glass _____

It is essential that the glass _____ thicker on the outside than on the inside and that the gap between the panes of glass _____

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问题 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.
选项 A、is, is
B、be, is
C、be, be
D、is, be
答案C
解析 虚拟语气在主语从句中运用，从句谓语动词用“should+动词原形”，should可以省略。故C正确。
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