单项选择题

The question of _____ the traffic accident happened hasn’t been answered yet, though the police have made on-the-spot investigation.

A．that
B．whether
C．how
D．whenever
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单项选择题
While shopping, people sometimes can’t help _____ something they actually don’t need.
A．to buy
B．buy
C．to buying
D．buying
单项选择题
What is the way people have thought of _____ enough money to help the poor children who can’t go to school
A．to raise
B．raising
C．having raised
D．raised
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