The great Pyramid is about 137meters high todays,but it was--once A higher B highest C high too

题目

The great Pyramid is about 137meters high todays,but it was--once A higher B highest C high too
D mor high,选什么,为什么呢

答案

A
题意：大金字塔今天大概137米高,但是它曾经(once）更高.
用形容词的比较级,high（单音节词）的比较级为higher,选A