单项选择题

Mary found _______extremely difficult to pass the examination.

A．it
B．this
C．that
D．what
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单项选择题
All that remained was to announce their _________and fix the date of the wedding.
A．engage
B．engagement
C．engaged
D．engaging
单项选择题
The old man has two daughters, _______are doctors.
A．both of them
B．both of whom
C．both who
D．they both
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