问题

We are often told _____ at people in trouble.
A:don’t laugh
B:to not laugh
C:not to laugh
D:to laugh;
B:to not laugh
C:not to laugh
D:to laugh;
正确答案是:
同类题型
Beyond the lake _____ quantities of birds coming fromthe North every winter.
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Would you mind waiting outside for a moment—
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