四六级写作，每年都是考后大家吐槽的重点对象，其难度可想而知，有意参加下半年考试的考生还是乖乖来复习一点常用短语留作备用吧!
原因
1.A number of factors are accountable for this situation.
A number of factors might contribute to (lead to )(account for ) the phenomenon(problem).
2. The answer to this problem involves many factors.
3. The phenomenon mainly stems from the fact that...
4. The factors that contribute to this situation include...
5. The change in ...largely results from the fact that...
6. We may blame ...,but the real causes are...
7. Part of the explanations for it is that ...
8.One of the most common factors (causes ) is that ...
9.Another contributing factor (cause ) is ...
10.Perhaps the primary factor is that
11.But the fundamental cause is that ...
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