[問題]GMAT pp 02-32

[pamelatsai]

There are hopeful signs that we are shifting away from our heavy reliance on fossil fuels: more than ten times as much energy is generated though wind power than it was in 1990.

(B) generated wind power than as it was
(C) generated wind power now as was the case

答案是(C)
請教為什麼是(C)不是(B)呢?

[sunkan]

b) 1)as....as s+v ,than是多餘的
2)我覺得it指的是energy,應該沒有指代上的問題
3)......now as ....in 1990,時間和時間做比較,平衡,