OG SC 104题不会做，求助！

azhongzhong

104. El Niño, the periodic abnormal warming of the sea
surface off Peru, a phenomenon in which changes in
the ocean and atmosphere combine allowing the warm
water that has accumulated in the western Paci?c to
?ow back to the east.
(A) a phenomenon in which changes in the ocean
and atmosphere combine allowing the warm
water that has accumulated
(B) a phenomenon where changes in the ocean and
atmosphere are combining to allow the warm
water that is accumulating
(C) a phenomenon in which ocean and atmosphere
changes combine and which allows the warm
water that is accumulated
(D) is a phenomenon in which changes in the ocean
and atmosphere combine to allow the warm
water that has accumulated
(E) is a phenomenon where ocean and atmosphere
changes are combining and allow the warm
water accumulating

我选的A，答案D，A、D不会比，求助！

azhongzhong

思来想去明白了！句子主干啊，我老是抓不住！谢谢清飞扬！

清飞扬

A的话，谓语呢？