单项选择题

I'm still unable to make myself ______ in the discussion, which worries me a lot.

A．to be understood
B．understanding
C．understood
D．understand
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单项选择题
Dick has never been on time, ______
A．has Dick
B．hasn't Dick
C．has he
D．hasn't he
单项选择题
John had an argument with Henry, ______ was known to all
A．what
B．that
C．this
D．which
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