[問題]PP-test(1)-Q68 ( structure )

[SL320]

The Mississippi riverboad, which [u]evolved[/u] from simpler [u]steamship[/u] of the early 1800's, became the [u]dominant [/u]form of [u]passenger transport [/u]on the mississippi River.
the Answer is B,
how to correct the word. thanks!

[whyc0907]

steamship改為steamships

[SL320]

可是riverboat, dominant form都是單數,這有必要一定用複數嗎?謝謝!!

[duck]

看看riverboat, dominant form之前是不是都有"the"作限定
The Mississippi riverboad & the dominant form
所以它可以單或複數

However,
"simpler steamship"沒有喔! 所以一定要加"S" ^^

[SL320]

thanks!