题目内容：
Everyone has periods in their lives ________ everything seems so hard.
（4.0分）4.0 分
A、
where
B、
which
C、
that
D、
when
参考答案：
选择题：Everyone has periods in their lives ________ every
- 题目分类：郑州航空工业管理学院-土木工程-公共英语（3）
- 题目类型：选择题
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Everyone has periods in their lives ________ everything seems so hard.
（4.0分）4.0 分
A、
where
B、
which
C、
that
D、
when