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题目内容
（河南城建学院-大学英语2）
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
A.haven.t heard
B. haven.t heard of
C.not to have heard of
D.not having heard of
参考答案