单项选择题

When ______ why he walked in without permission, he just stared at us and said nothing.

A．asking
B．asked
C．being asked
D．to be asked
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单项选择题
I find the article difficult______.
A．to understand
B．to be understood
C．understanding
D．understand
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
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