关于OG11-15,问个新问题

15. The Iroquois were primarily planters, but supple­mentinq their cultivation of maize, squash, and beans with fishing and hunting.

(C)and even though they supplemented

(D)although they supplemented

(E)but with supplementing

Grammatical construction + Verb form

The participle supplementing would normally be expected to modify the first clause, describing or extending its meaning, but the logic of this sentence demands a contrast, not an extension. Consequently; the second part of the sentence must be revised to emphasize the contrast properly. The logic of the sentence also argues against a construction that would set the two clauses and the importance of their content equal when they clearly should not be. The best solution is to have the main clause describe the primary activity, and a subordinate clause, although they supplemented, describe the supplementary activity.

B And does not convey contrast; had supplemented is the past perfect tense but the simple past is required to match were

C And does not convey contrast and should be omitted;
                and even though creates a sentence fragment ,:

D Correct. Using although creates a subordinate clause in this sentence and logically links that clause with the main clause; the simple past
                supplemented parallels the simple past were.

E But with is awkward and unclear; supplementing is a modifier when a contrasting clause is needed
                        

The correct answer is D.

A The Iroquois were primarily planters, but supple­mentinq their cultivation of 怎么不好了? 怎么就不能准确表达意思了?实在不懂. 很多情况下, 不是还用Sb. does sth while doing sth了吗???

A The Iroquois were primarily planters, but supple­mentinq their cultivation of 怎么不好了? 怎么就不能准确表达意思了?实在不懂. 很多情况下, 不是还用Sb. does sth while doing sth了吗???

The participle supplementing would normally be expected to modify the first clause, describing or extending its meaning, but the logic of this sentence demands a contrast, not an extension.

楼主多体会体会这句解释。

是不是因为contrast，所以两个句子需要结构上一致？

LSW, Thanks for your reminder! I got it.

The reason that this sentence does not use "but supplimenting" is  "this sentence demands a contrast, not an extension - to modify the first clause".