9．It is the high rate at which HIV is spreading ________ makes UNAIDS worried a lot．（　�。�
A．whatB．whichC．thatD．it

分析 正是艾滋病的高傳播率使得UNAIDS（聯(lián)合國艾滋病規(guī)劃署）異常擔(dān)憂．

解答 答案為C．
強(qiáng)調(diào)句的基本結(jié)構(gòu)為"It is/was+被強(qiáng)調(diào)成分+that/who+剩余成分"，其中當(dāng)被強(qiáng)調(diào)部分指人時既可以用that亦可以用who引導(dǎo)，被強(qiáng)調(diào)成分不指人時只能用that引導(dǎo)．該題被強(qiáng)調(diào)成分為"the high rate"不指人，"at which HIV is spreading"為修飾"the high rate"的定語從句，故引導(dǎo)詞選用that．

點評 該題考查強(qiáng)調(diào)句的基本運用，但是在被強(qiáng)調(diào)部分加入定語從句容易對學(xué)生對該句結(jié)構(gòu)理解造成干擾．

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