单项选择题

I have finished a large part of the book, the rest of which ______ more difficult to me.

A．is
B．are
C．was
D．were
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单项选择题
______ your work in case you've made any mistakes.
A．Take care of
B．Ensure
C．Look out for
D．Check
单项选择题
Sometimes we are asked ______ we think the likely result of an action will be.
A．that
B．what
C．if
D．whether
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