问题
选择题
| As a teacher, I seldom give my students so difficult a problem ____ they can not work out. |
A. that B. if C. in order that D. as |
答案
答案：D
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| As a teacher, I seldom give my students so difficult a problem ____ they can not work out. |
A. that B. if C. in order that D. as |
答案：D