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

游客2024-10-05  9

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 虚拟语气题。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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