各位NN们~~请求帮助~！！OG12 SC50~~~~~~~~~

jili_111

楼上说的有道理，我也在曼哈顿看到过，不过by+时间，和earlier in the year毕竟还是有些区别的吧，没强调停止，所以我也不确定啊，不过我倒是觉得2楼说的虚拟语气挺有道理的。

village203

note that the past perfect can be used, roughly speaking, in two different circumstances:

1) for past actions that were ongoing until, or relevant to, a later past action (this is what you're thinking about);
OR

2) for past actions that were ongoing until, or relevant to, a later past TIME MARKER.

for #2, the second time marker could be something explicitly mentioned in the sentence.

before the introduction of soft landing mats, high jumpers had been forced to use the western-roll style of jumping

--> note that there is no second verb, but "the introduction of soft landing mats" is a time marker.

however, if the context of the sentence clearly IMPLIES a second time marker, then that second time marker may not even have to be mentioned explicitly.
in this sentence, the second time marker is implied by the phrase "earlier in the year" -- i.e., these fears were ongoing until a certain point that is already in the past

建议去下个OG12千行，是版主的精华帖一搜就有，对照着看OG13，只有少数新题没有，其他题目讲解非常相信，会有帮助的！