gwd29-36

  Section 301 of the 1988 Omnibus Trade and Competitiveness Act enables the United States Trade Representative to single out a country as an unfair trader, begin trade negotiations with that country, and, if the negotiations do not conclude by the United States government’s being satisfied, to impose sanctions.

1. by the United States government’s being satisfied, to impose
2. by the United States government’s satisfaction, impose
3. with the United States government’s being satisfied, imposing
4. to the United States government’s satisfaction, impose
5. to the United States government’s satisfaction, imposing

答案选 D， 我想知道 这里为什么用to 不用by