一道英语题求解.（）theories approximate the truth is the day-to-day b

选A.
译文：确定理论究竟有多接近事实,这是在科学研究中每日必做的事情.

Determining how closely theories approximate the truth 这是动名词词组做主语.其中how closely theories approximate the truth 是宾语从句（是动词determine的宾语）,正常语序是：
Theories（主语） approximate（谓语） the truth（宾语） (how) closely（状语）.

选择A 主谓宾 缺主语 缺一个可以当主语的句子 而A可以

Hu Ming's school life.
One month ago Hu Ming moved to Shanghai from Tianjin with his parents. He likes his former school but he had to leave there. There are more students in the new school than...