【題目】Often he__________ sit for hours doing nothing at all when he was in low spirits.
A.should
B.would
C.could
D.might

【答案】B
【解析】情態(tài)動詞should意為“應(yīng)該”；could和might意為“可能”，前者表示的可能性更大；此處would相當(dāng)于used to，表示過去的習(xí)慣動作。句意：他情緒不高時，經(jīng)常一坐就是幾個小時，什么也不做。故答案選B。

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