正确答案: B

on

题目：Our school has a speech contest ________May 4th．

解析：1．B  【解析】在具体的某一天用on．

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学习资料的答案和解析：

[单选题]He never does his work ________Mary．

as carefully as

解析：21．C【解析】由句意“他做事从来不如玛丽那么仔细”。选择A和B要注意do是行为动词，要用副词来修饰。故选C．