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. Under no circumstances ______ anything that will harm the feeling of others.

A. should I do
B. I should do
C. shall I do
D. I shall do