Question

If you want a letter _________, you must keep in mind several rules while _________．

1. A.
   written; written
2. B.
   well written; writing
3. C.
   well writing; writing
4. D.
   well written; write

Answer 1

B
第一个空为过去分词作定语，分词与它修饰的名词之间为被动关系，所以用过去分词。第二个空是while加现在分词作时间状语。现在分词与其逻辑主语之间为主动关系。分词作定语时要注意它与被修饰词之间的关系；作状语时注意它与其逻辑主语之间的关系。