历史难题－－补充材料250中的140

joywzy

104.    For some birds the sense of smell appears to play a role in navigation, since pigeons with surgically removed olfactory nerves were found to have increased difficulties in homing.
(A) were found to have increased difficulties
(B) have been found to have increased difficulty
(C) were found to have increasing difficulty
(D) had been found to have increased difficulties
(E) have been found to have increasing difficulties

答案：B，我选了E

这题该如何判断呢？谢谢。

anchoret

have increasing difficulties中increasing是形容词，
have increased difficulties中的increased是动词，不是形容词

强调的明明是某物增加了某某的困难，当然选b.选e强调的是状态

joywzy

difficulty的单复数该怎么考虑呢？谢谢。

小安，可不可说，以后见到increasing , increased ,就选increased？

anchoret

不可以，要看强调的内容。

braveMBA

difficulty单数是侧重在抽象的困难，如这事有难度；difficulties是侧重在具体的难度上，如完成这事有很多困难。

hiddragon

请问如何考虑这题用现在完成时而不用过去时？

Mission

I feel that "increased" here is not a verb. It is used as an adj, It is not logical if the pigeon have increased difficulty itself.  it should be the fact that "removing olfactory nerves" increased  the pigeon's difficulty in home.

Do not know it is right, any opnion?

merlion

agree。 increased: 增加的， 表以完成的； increasing:日益增加的,表进行中的