单项选择题

Tom's grandmother had to look ______ his little daughter at home as he took a business trip to another city．

A．for
B．after
C．at
D．out
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单项选择题
Few of us thought that the problem was worth ______.
A．discuss
B．discussing
C．discussed
D．to discuss
单项选择题
______ some money，Jimmy was able to buy his mother a washing machine．
A．To save
B．Saving
C．Saved
D．Having saved
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