(单选题)

These dresses are already pretty and I ______ decide which one to buy.

A.don’t

B.mustn’t

C.won’t

D.can’t

参考答案：D

参考解析：

考查情态动词表必须。句意：这些裙子很漂亮，我不知道该买哪件。don’t意为“不”；must意为“必须，肯定，一定，硬要，偏要”，其否定形式表示“禁止”；will意为“会”，表示某种主观意愿；can意为“能够，可能”，表示主观具有的能力或者客观存在的可能性，其否定形式表示“不可能，不能”。根据题意，本题表示“无法决定，决定不了”，因此D项合适。故选D。

知识点：

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