单项选择题


A．essential
B．elementary
C．necessary
D．principal
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单项选择题
Tom said that he wouldn't mind ______ .
A．to wait for us
B．waiting for us
C．wait for us
D．for waiting us
单项选择题
Helen apologized for ______ to attend the party.
A．her not being able
B．her being not able
C．her to be not able
D．her not to be able
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