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20．-Who______ it be that is knocking at the door？
-It ______ be Father，but I'm not sure．（　�。�

A．

can； must

B．

can； may

C．

must； can

D．

may； must

分析 --可能在誰在敲門呢？
--也許是父親，但是我不確定．

解答答案是B．本題考查情態動詞辨析．在疑問句中表示可能性的推測往往用can，may和must表示推測不出現在疑問句中，所有答案在A 和B中選擇；must表示推測時是非�？隙ǖ挠幸罁呐袛啵琺ay表示不確定的推測；根據下文的not　sure判斷不確定是父親，所以第二空選擇may，故答案選擇B．

點評要在正確理解情態動詞的基本含義的基礎上，整體理解語境中的情感態度，做出合理的判斷．

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