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)選擇了另一個事業(yè)，但是那時候他沒有足夠的錢上大學．

解答 答案：B
解析：A：或許選擇（一般過去時）；B：可能已經(jīng)選擇了（對過去的虛擬）；C：本應該選擇（而實際未選擇）；D：可能選擇（一般過去時）．根據(jù)后面的"但是那時候他沒有足夠的錢上大學"可知前面句子是對過去的虛擬，故A、D選項直接排除；C選項代入原句后不符合句意，故排除（因為是沒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選項代入原句符合句意．綜上，本題答案為B選項．

點評 本題考查情態(tài)動詞的辨析，做此類題目時一定要清楚各個選項的含義及用法，再結(jié)合句意及其它要求確定最終的答案．

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