4．He ________ another career，but at the time he didn't have enough money to attend graduate school．（　　）
A．might chooseB．might have chosen
C．should have chosenD．could choose

分析 他有可能已經(jīng)選擇了另一個(gè)事業(yè)，但是那時(shí)候他沒有足夠的錢上大學(xué)．

解答 答案：B
解析：A：或許選擇（一般過去時(shí)）；B：可能已經(jīng)選擇了（對(duì)過去的虛擬）；C：本應(yīng)該選擇（而實(shí)際未選擇）；D：可能選擇（一般過去時(shí)）．根據(jù)后面的"但是那時(shí)候他沒有足夠的錢上大學(xué)"可知前面句子是對(duì)過去的虛擬，故A、D選項(xiàng)直接排除；C選項(xiàng)代入原句后不符合句意，故排除（因?yàn)槭菦]錢這一客觀原因使得他未能選擇另一事業(yè)，而并非自己主觀不選）；B選項(xiàng)代入原句符合句意．綜上，本題答案為B選項(xiàng)．

點(diǎn)評(píng) 本題考查情態(tài)動(dòng)詞的辨析，做此類題目時(shí)一定要清楚各個(gè)選項(xiàng)的含義及用法，再結(jié)合句意及其它要求確定最終的答案．

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