1,I，11 never understand                 that you made such a stupid mistake. (come)

我真不明白你居然犯了這么個(gè)愚蠢的錯(cuò)誤。

1. how it came about考查賓語(yǔ)從句和it作形式主語(yǔ)的用法。it指代后面的整個(gè)句子，作形式主語(yǔ)。how引導(dǎo)的賓語(yǔ)從句要用陳述句語(yǔ)序。come about發(fā)生。

題目來(lái)源：高考丟分題英語(yǔ) > Unit 4 Global warming

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