19．Some of you may have finished Unit One．________，you can go on to Unit Two．（　�。�
A．If you mayB．If you doC．If notD．If so

分析 你們中有些人已經(jīng)完成第一單元．如果是這樣，你們可以繼續(xù)第二單元．

解答 答案是D．本題考查狀語從句的省略句和替代．if  so如果是這樣，用so 代替上文的一件事；其否定形式是if not如果不是；英語中省略往往是為了避免重復(fù)的省略；if you may往往用于省略與上文相同的實意動詞，表示"如果你可以做…"；if you do表示"如果你…"，其中do 代替上文出現(xiàn)的動詞一避免重復(fù)；本題用so代替上文的"you have finished Unite One"這件事，故答案選擇D．

點評 本題考查省略，省略常常是為了避免重復(fù)的省略，所以要在補全被省略的部分的情況下整體理解語境，再做判斷．此外很多省略的結(jié)構(gòu)已經(jīng)成為固定結(jié)構(gòu)，要積累．

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