单选题 ______ that they may eventually reduce the amount of labor needed on construction sites by around 90 percent.

A、 So clever are the construction robots
B、 So clever the construction robots are
C、 Such construction robots are clever
D、 Such clever construction robots are

【正确答案】 A

【答案解析】that后面是表示结果的状语从句，与主句中修饰clever的副词so相呼应。应注意，so放在句首时，有强调状语的作用，主谓应该倒装。例如：So fast does sound travel that it is difficult for us to imagine its speed．声音的传播速度快得使我们难以想象。