单项选择题

Linda often helps her mother ______ the housework on weekends.

A． of
B． with
C． to
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单项选择题
-- Have you finished ______ the book-- Not yet. I'll try ______ it to you before Friday.
A． reading, returning
B． to read, to return
C． reading, to return
单项选择题
Many people watched the boys ______ the mountain at that time.
A． climb
B． climbing
C． to climb
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