Question

【题目】____ is often the case, the teacher has made the teaching plan before the new term.

A. Which B. When C. What D. As

Answer 1

【答案】D

【解析】试题分析：as is the often case固定表达，表示“通常情况下”。该表达中as引导非限制性定语从句，指代主句整句内容，且在从句中作主语。故选D。