With a subordinator:Ideally, we should have twice as much house

With a subordinator:
Ideally, we should have twice as much house space ______we have now.
【正确答案】：as
【题目解析】：As + many/much +名词+as意思为“……和……一样”；as…as还可以用来表示倍数，twice，three times，half或a quarter 置于第一个as之前，“……是……的几倍”。