1.Broken down by race, about 40 percent of U.S.-born Asians now marry
whites----a figure ____ since 1980.
a.changing b. changed c. unchanging d. unchanged
答案是d，可是為什麼呢?
2. Thiwan Power Co. is building solar stations and wind turbines
as the government aims to have renewable energy ___ carbon emission.
a. helping to cut b. help to cut c. to help cut d. to help cutting
這題是選c，可是為什麼b不可以呢?
謝謝大家的回答。
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