A. | what | B. | how | C. | that | D. | where |
分析 是什么引起的這起事故仍然完全是個(gè)謎.
解答 答案A
本題是it作形式主語的主語從句.為了保持句子的平衡,常用it作形式主語,而把真正的主語放在后邊.分析句子可知,從句中缺少主語,故應(yīng)選擇代詞,排除B、D兩項(xiàng).由于what是兼詞,即:既做成分,又做連接詞.而that只作連接詞,不做成分.故選A項(xiàng).
點(diǎn)評(píng) 考查主語從句.主語看看從句中是否缺少成分,如果缺少主語、賓語等,則選擇代詞what/whatever等;如果缺少狀語,則選擇副詞;如果不缺少成分,則只選擇連接詞,如that(無意義),whether(是否)等.
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