species和fish都是单复数相同的,怎么判断用代词是应该用单数还是复数?
比如:150.(32705-!-item-!-188;#058&007266)
Hydrocarbons, with which fruit flies perfume themselves in species-specific blends, are known to be important in courtship, and apparently this assists flies that taste the hydrocarbons on prospective mates to distinguish their own species from that of others.
(A) and apparently this assists flies that taste the hydrocarbons on prospective mates to distinguish their own species from that of
(B) and apparently this assists flies when they taste the hydrocarbons on prospective mates in distinguishing their own species from those of
(C) which apparently assists flies that taste the hydrocarbons on prospective mates in being able to distinguish their own species from
(D) apparently assisting flies to taste the hydrocarbons on prospective mates to distinguish their own species from those of
(E) apparently assisting flies that taste the hydrocarbons on prospective mates in distinguishing their own species from 这里是不需要that/those指代的,我主要是想知道如果需要的话,是that还是those |