◎ 题干
I don't know whether you happen _____, but I'm going to study in the U.S.A this September.
[     ]
A. to be heard
B. to be hearing
C. to hear
D. to have heard
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“I don't know whether you happen _____, but I'm going to study in the U.S.A this September. [ ]A. to be heard B. to be hearing C. to hear D. to have hear…”主要考查了你对  【不定式的完成式】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。