one grammar question in ppreview

beckyfxie

The Mississippi riverboat, which evolved from simpler steamship of the early 1800's, become the dominant form of passenger transport on the Mississippi River.

Why don't ppreview2 choose D but others?

Another one:

Published in 1957,John Cheever's first novel, The Wapshot Chromicle, earned ___ the National Book Award.
a. that he had   b.him   c.was his   d.to him

Why don't ppreview2 choose B but others?

williamd

1.key:b
steamship没有限定词，显然错误
2.应该选B，PPREVIEW2的答案可能是错了

williamd

是不是你的REVIEW有问题，我刚看了一下，2的答案，REVIEW中是B