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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The teacher has his students ______ a subject report every month.
A．to write
B．written
C．writing
D．write
单项选择题
Scarcely had he gone out ______ .
A．that is started to snow
B．than it started to snow
C．when it started to snow
D．and it started to snow
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