17．---Why not ask Bob to join us in the school trip？
---I can't tell if he's able to．He's always __ _ with his work．（　�。�
A．carefulB．familiarC．casualD．busy

分析 為什么不邀請Bob參加我們的學(xué)校旅程？--我不確定他是不是能來．他總是忙于工作．

解答 答案：D 根據(jù)"ask Bob to join us"可知想邀請Bob去參加活動．根據(jù)"if he is able to"可知不確定他是不是有空，能來．說明他肯定是有事或很忙．故此處需要"繁忙的"．careful小心的；familiar熟悉的；casual偶然的；busy忙碌的．故選D．

點(diǎn)評 本題考查形容詞的詞義辨析．需要體會題目中想要表達(dá)的意思和感情．進(jìn)而判斷所需要的意思，選擇正確的答案．

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