19．-Where is Lucy？
-I can't say for sure where she is，but she _______ be out shopping．（　　）
A．canB．shouldC．mustD．may

分析 --Lucy在哪里？--我不能確定，但是她也許出去購物了．

解答 答案是D．本題考查情態(tài)動詞的辨析．can能夠；should應該；must肯定；may也許；根據(jù)句意"I can't say for sure不能肯定"推測說話人認為"她也許去購物了"，故答案選擇D．

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

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