AS和LIKE的用法？

以下是引用hiddragon在2003-10-5 20:39:00的发言：
1.Similar to rising interest rates, consumer and producer prices have been rising.
A.omitted.
B.Consumer and producer prices have been rising, as have interest rates.
C.As interest rates are rising, so have consumer and producer prices.
D.Consumer and producer prices have been rising, like interest rates do.
E.Consumer and producer prices, as interest rates, have been rising.
我选了D，因为有一题是这样的：
2.The guiding principles of the tax plan released by the Treasury Department could have even a greater significance for the economy than the particulars of the plan.
答案是：even greater significance for the economy than do
第一题的答案是B，我要问的是，什么情况下用have,什么情况下用do?请牛牛们讨论一下。