20．It's a pitythat he can't take part in the outing with us because of his sick mother．（語法填空）

分析 很遺憾他不能與我們一起參加外出游玩，因?yàn)樗哪赣H生病．

解答 答案：that
考查語法填空．It is a pity that…是it用法的一個(gè)句型，it是形式主語，that引導(dǎo)的從句是主語從句，意為"很遺憾…"．

點(diǎn)評(píng) 考查單詞填空，準(zhǔn)確地理解句子、翻譯句子，然后根據(jù)句意及提示確定所填單詞詞性，對(duì)于動(dòng)詞要注意時(shí)態(tài)，名詞要注意單復(fù)數(shù)，正確寫出單詞完成句子，使句意更通順．

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