问题
选择题
I_______ my homework at nine o'clock last Sunday morning.
A. am doing B. was doing C. do
答案
B
考查时态。由句中的时间状语可以判断句中应用过去进行时
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I_______ my homework at nine o'clock last Sunday morning.
A. am doing B. was doing C. do
B
考查时态。由句中的时间状语可以判断句中应用过去进行时