单项选择题

I find the article difficult______.

A．to understand
B．to be understood
C．understanding
D．understand
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单项选择题
Do ______ you think is right ______ difficulties you may have.
A．what…however
B．that…what
C．whatever…whoever
D．what…whatever
单项选择题
______ a satisfactory answer, so he had to write to them again.
A．As he hadn't received
B．Not having received
C．Having not received
D．He hadn't received
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