问题
What were you doing this time yesterday —I _______ some cleaning at home.
A:am doing
B:was doing
C:do
D:did
B:was doing
C:do
D:did
正确答案是：
同类题型
You should take _____ of this opportunity and try tomake a good impression on them
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When people started questioning his explanation,he had to______ more details. [ ]