单项选择题

When Jane fell off the bike, the other children ______ .

A．were not able to help laughter
B．could not help but laugh
C．could not help to laughing
D．could not help to laugh
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单项选择题
He was living in France when the war ______ .
A．broke off
B．broke into
C．broke out
D．broke through
单项选择题
He studied hard at school when he was young, ______ contributed to his success in later life.
A．which
B．that
C．what
D．each of which
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