【題目】Cancer has become the top killer ________ I think threatens the health of millions of people.

A.thatB.of whichC.不填D.Both A and C

【答案】A

【解析】

考查定語從句。句意：我認(rèn)為癌癥已經(jīng)成為威脅數(shù)百萬人健康的頭號(hào)殺手。分析句子可知，I think 為插入語，可暫且不管；這是一個(gè)定語從句，且先行詞是top killer，從句中缺主語，故可用that或which。結(jié)合選項(xiàng)，故選A。

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