18．-He is supposed to turn up at 6，but…
-Here they are．I ___see their car．（　�。�
A．am able toB．canC．mightD．should

分析 --他應(yīng)該6點鐘到達，但是…
--他們在這兒．我能看到他們的車子．

解答 答案是B．本題考查情態(tài)動詞的區(qū)別．be able to 表示"經(jīng)過努力之后能夠…"； can表示"能夠（本能）；可能（推測）；可以（請求許可）等"；might表示"也許"；should表示"應(yīng)該；萬一；竟然'"；根據(jù)句意是"我能看到"，不強調(diào)努力，所以答案是B．

點評 要在正確理解情態(tài)動詞的基本含義的基礎(chǔ)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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