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 laughing
C. could not help laughing
D. could not help to laugh
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They lost their way in the forest, and ______ made matters worse was that night began to fall.
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Living in the central Australian desert has its problems, ______ obtaining water is not the least.
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