单项选择题

Directions :In this section, there are 10 incomplete sentences. You are required to complete each one by deciding on the most appropriate word or words from the 4 choices marked. Then you should mark the corresponding letter on the Answer Sheet with a single line through the centre. The children all laughed in ______ to the funny behavior that he gave.

A. respond
B. responds
C. response
D. responding
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