题目内容：
When asked to give his opinion on the failure of file experiment, he pretended ______ it.A.haven.t heard
B. haven.t heard of
C.not to have heard of
D.not having heard of
参考答案：
选择题：When asked to give his opinion on the failure of f
- 题目分类：河南师范大学-工商管理-大学英语Ⅱ
- 题目类型：选择题
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A.haven.t heard
B. haven.t heard of
C.not to have heard of
D.not having heard of