The study had three windows, set with little, old-fashioned panes of glass, each with a crack across it.

It is essential that the glass ________ thicker on the outside than on the inside and the gap between the panes of glass ________ a minimum of seven centimeters. A: is, is B: be, be C: be, is D: is, be

The study had three windows, set with little, old-fashioned panes of glass, each with a crack across it. 以下译文哪个更为准确？ A: 书房的窗户有三扇，每扇嵌的都是老式的小块玻璃，每块玻璃上都有裂痕。 B: 书房有三个窗户，每个窗户上都嵌着带有裂痕的老式的小块玻璃。