请教《50个最容易错的语法题》的几道题

liuzw71

51, (when) and (by whom) the islands of the west Indies were first settled i
s a matter (of debating) (among) archaeologists.

53, (from the top ) of the tower, Jacob was able ( to clearly and easily see
) the (whole ) city (stretching) out below him.

54, Joan ( decided) that she did not like the (girl eating) an ice-cream con
e on the bus after (she) ( yelled) at her little brother.

对答案不太理解，希望大侠解答一下。

flyinflower

我选C,D,B,请问答案是什么哦？