※ 引述《maitri (做人呢，最要緊就是開心)》之銘言：
: Some anthropologists believe that the genetic homogeneity evident in the
: world's people is the result of a "population bottleneck"—at some time in
: the past our ancestors suffered an event, greatly reducing their numbers and
: thus our genetic variation.
: (A) at some time in the past our ancestors suffered an event, greatly
: reducing their numbers
: (B) that at some time in the past our ancestors suffered an event that
: greatly reduced their numbers
: (C) that some time in the past our ancestors suffered an event so that their
: numbers were greatly reduced,
: (D) some time in the past our ancestors suffered an event from which their
: numbers were greatly reduced
: (E) some time in the past, that our ancestors suffered an event so as to
: reduce their numbers greatly,
: 我想請問破折號的用法，ＯＧ說法是：
: Scientists believe that X—[in other words,] that Y. In this construction, X
: and Y are parallel clauses.
: 我知道破折號是解釋補充，用that Y解釋that X，
: 所以兩者需平行的意思嗎？
沒錯，需要平行。
不然你不知道破折號後解釋補充到底是從some anthropologists...開始
還是從that....開始。既然這邊是解釋補充that子句，
那麼就須補出that表示是跟誰平行。
Dustin
: 因為一看到parallel，我馬上就想到用"and"來連接，
: 可答案沒這選項～
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