They have produced _____

题目

They have produced _____
A.10 more pianos this month than last month
B.10 pianos more this month than last month
C.10 pianos this month as many as last month
D.10 as many pianos this month as last month 我已经知道答案是A 谁能给我彻底解释下不选c的原因 包括为什么在c中 as many as后面加上they did 就对的原因呢?

答案

as...as...
2个用法
1. 第二个as介词 he is as tall as his father.
2.第二个as连词 he is as tall as his father is.
题目中可以this month/las month是时间状语,所以as必然不是介词,如果是连词的话,就要加上主谓语they did.