They were busy ________ an experiment when I came.
A:doing
B:to be doing
C:with doing
D:to do
发布时间:2024-05-07 16:10:15
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--- I ______ my work, and I wanted to go out.
选项: A:have you done; finished
B:were you doing; have finished
C:did you do; had just finished
D:were you doing; had just finished