02-05-20 02-05-25 02-05-37 02-05-39 有谁能帮我！！

richardn

下面有几道2002年五月的语法题，我不知道怎么改请高手告诉我原因，谢谢了
20. An accomplished saxophonist (and composer), John Coltrane (begun) his (career playing) in the big bands of (the early) 1950's.
答案是B.
25. (Addressing) themes that were (unique) American, the poet Walt Whitman (celebrated) the lives of (ordinary people).
答案是B.
37. Searching for (alternate) forms of energy does not (necessary) mean (the abandonment) of fossil fuels as an energy (source).
答案是B. Why??
39. (Due to) persistent inbreeding, self-pollinating plants (have) genetically more uniform than cross-pollinated plants, (which) harbor more genetic (variability).
答案是B.

ecsniffer

20、begun改为began


37、necessary改为necessary to

lcbfeng

20. An accomplished saxophonist (and composer), John Coltrane (begun) his (career playing) in the big bands of (the early) 1950's.
答案是B.

B is wrong. should be "began"

lcbfeng

25. (Addressing) themes that were (unique) American, the poet Walt Whitman (celebrated) the lives of (ordinary people).
答案是B.

B is wrong. missing the prep. "to", it is a slam

lcbfeng

37. Searching for (alternate) forms of energy does not (necessary) mean (the abandonment) of fossil fuels as an energy (source).


答案是B. Why??

here necessary modify verb "mean", should use "necessarily"

lcbfeng

39. (Due to) persistent inbreeding, self-pollinating plants (have) genetically more uniform than cross-pollinated plants, (which) harbor more genetic (variability).
答案是B.

here "have" should change to "are", cuz uniform is an adj.

richardn

有没有人知道20题为什么错吗？

enjoylife517

同意3楼的意见呀，是时态问题