Test analysis: First of all, be familiar with the types of ill sentences. The most commonly used method is to divide the structural components of a sentence, first look at the subject, predicate and object, and then look at the definite complement to judge whether there are problems such as incomplete components, improper collocation, chaotic structure and improper word order in the sentence. If there is no problem in structure, we can analyze it from a logical point of view to see if there are any problems such as unclear meaning and improper relationship between sentences and meanings. Another simple method is to use the symbolic method. For example, there are related words in a sentence, which can be considered from three aspects: collocation, word order and logic. If prepositions appear, they can be considered from the perspectives of incomplete subject, midway change and inversion of subject and object.

Item b is illogical, and "avoid" and "no" lead to improper negation; Improper collocation of item C, "causing the burden of" or "undertaking the task of"; Item D is incomplete and lacks a subject, so "about" should be removed.