The word and is the most common and important parallel marker. Moreover, the GMAT always inserts a comma before the and in lists of 3 or 4 items. However, if you join 2 clauses with and, you can put an optional comma before the and. Doing so is especially recommended when the clauses are long, independent, or both.
这是Manhattan的原文 我有点疑问对于这部分“ However, if you join 2 clauses with and, you can put an optional comma before the and. Doing so is especially recommended when the clauses are long, independent, or both.”当and 前后两部分是长的并且独立的可以不加comma, 难道可以有形式 SVO AND SVO 只要两部分 long, independent, or both.? 求解
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