bricks workers press clay into blocks and bake them to the requisite hardness in a kiln.

问题补充：

． bricks，workers press clay into blocks and bake them to the requisite hardness in a kiln.

A. Made

B. To make

C. Being made

D. To be made

答案：

A. Made

(答案→)B. To make

C. Being made

D. To be made

解析：句子需要的是目的状语。根据空白后的宾语bricks，可排除被动形式的being made和to be made，又根据过去分词短语用作状语，很多都说明动作发生的背景或情况，所以A不对；而B不定式短语作状语表行为目的，正合适。句意：为了制砖，工人们把粘土压成块状，然后在砖窑里烧到必要的硬度。