单项选择题

_________ is quite difficult for Mary to pass the interview.

A．What
B．This
C．That
D．It
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单项选择题
_________the meat on the gas cooker, he began to watch TV.
A．Put
B．Putting
C．Being put
D．Having put
单项选择题
_________around our city, the foreigners were invited to have attend an evening party.
A．Have shown
B．Having been shown
C．Been shown
D．Being showing
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