XY 1 Q16 关于than后面省不省前面的主谓

Q16:

Soaring television costs accounted for more than half the spending in the presidential campaign of 1992, a greater proportion than it was in any previous election.

1. a greater proportion than it was

2. a greater proportion than

3. a greater proportion than they have been

4. which is greater than was so

E which is greater than it has been

答案是选B，省去了后面的主谓，如果加上，是不是应该是 a greater proportion than they did?

我选错了，选成了C。这道题选B，是不是因为后面补足了的答案都是错的。谢谢

To develop more accurate population forecasts, demographers have to know a great deal more than now about the social and economic determinants of fertility.

1. have to know a great deal more than now about the social and economic

2. have to know a great deal more than they do now about the social and economical

3. would have to know a great deal more than they do now about the social and economical

4. would have to know a great deal more than they do now about the social and economic

E. would have to know a great deal more than now about the social and economical

这到题选E，为什么不选C呢？这到题和上题一样，THAN后面都省去了主谓，到底什么时候该省呢？还是能省就省？

Q20:

Rivaling the pyramids of Egypt or even the ancient cities of the Maya as an achievement, the army of terra-cotta warriors created to protect Qin Shi Huang, China’s first emperor, in his afterlife is more than 2,000 years old and took 700,000 artisans more than 36 years to complete them.

1. took 700,000 artisans more than 36 years to complete them

2. took 700,000 artisans more than 36 years to complete it

3. took 700,000 artisans more than 36 years to complete

4. 700,000 artisans took more than 36 years to complete

E. to complete them too 700,000 artisans more than 36 years

这个题选B,不选C，为什么呢？我觉得 The army took 700,000 artisans more than 36 years to complete. COMPLETE后面的宾语可以省的，就是主语呀。谢谢

Q16:

Soaring television costs accounted for more than half the spending in the presidential campaign of 1992, a greater proportion than it was in any previous election.

1. a greater proportion than it was

2. a greater proportion than

3. a greater proportion than they have been

4. which is greater than was so

E which is greater than it has been

答案是选B，省去了后面的主谓，如果加上，是不是应该是 a greater proportion than they did?

我选错了，选成了C。这道题选B，是不是因为后面补足了的答案都是错的。谢谢

比较对象（proportion)一致，省略；补出应该是 a greater proportion than it had been

Q32题我选A，economic and economical 意思不一样，这个还需要请教大家

Q20就是尽量补出原则了，再说它离主语已经很远了，意思上也需要补出明确一下