問題詳情：
- I didn't see you at Jim's party last week.
- I had to work that evening, so I _________ go.
A. needn't B. mustn't C. couldn't D. shouldn't
【回答】
C
【解析】考查情態動詞辨析。句意：——上週我沒有在吉姆的聚會上看到你。——那天晚上我必須得工作，所以我不能去。Needn’t意爲“不必”；mustn't意爲“禁止，不許”；couldn't意爲。不能”，shouldn't意爲“不應該”。由“I had to work that evening”可知是“不能去”。故選C。
知識點：情態動詞
題型：選擇題
