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Test analysis: There is no punctuation between "May 6th" in sentence D, because "May 6th" is one word, not two. You can have no colon in a sentence. If there is a comma at the pause of sentence B, it is wrong. C sentence colon can also be a comma.

Comments: This question is a bit difficult. Students usually don't pay much attention to the correct use of punctuation marks, which are more complicated. Teachers also talk less and students have no knowledge accumulation. Punctuation marks are also words, and correct use can help us read sentences well and understand their meanings. Usually, we should pay attention to the usage of punctuation marks in reading and writing, and analyze the punctuation marks and usages that are easily confused, such as commas and pause, "sentences with small comma intervals" and "phrases" with large pause intervals. Another example is commas and periods. Comma is used when the meaning of a sentence is not fully expressed and needs a short pause, and period is used when the meaning is expressed and needs a big pause.