_____is today Britain used to be three different countries,and over many years the three countries became one.
A,It     B,What      C,Where      D,As
C

試題分析：通過分析句子結(jié)構(gòu)，可知這是一個復合句，其中包含一個主語從句，且引導詞在從句中作地點狀語，故用Where 。
點評：主語從句通常由連詞that和whether、連接代詞或連接副詞以及關(guān)系代詞型what引導。解答這類題目，關(guān)鍵在于分析清楚句子結(jié)構(gòu)。通過判斷引導詞在從句中所作的成分及意義，來選擇正確的引導詞。
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