不加by也可以,using做伴随方式状语
前后都有rather than,平行。
attract和call平行
"instead of" is generally restricted to nouns. "rather than" can be used for essentially any part of speech at all. they moved stiffly rather than gracefully (adverbs) they moved to the left rather than to the right (prepositional phrases) the car was red rather than blue (adjectives) i bought a car rather than a truck (nouns) <–– this is the only sentence here that would work with 'instead of' he chose to leave rather than continue arguing (infinitives)
主干:S believe that... male whisting moths... call female moths... and attract their mates... 这道题要分析句子在讲什么,三个枚举的价格,而是and连接两个动词的形式。call and attract。 在A选项中,by 后应该跟动词分词,SUBJECT + ACTIVE VERB + BY + NOUN is generally incorrect.
both "by using" and "using" are fine. - Ron
谓语并列call和attract
保持平行的由两组:call & attract,两个rather than
保持平行的由两组:call & attract,两个rather than
call和attract平行 rather than好
call 和attract 并列关系
审题必须仔细。attract与call并列。
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