—Whatwereyoudoingwhenthealiengotoutofthe
题型:选择题
问题:
—What were you doing when the alien got out of the UFO?
—I _______ in front of the library. [ ]
A. stand
B. standing
C. was standing
—What were you doing when the alien got out of the UFO?
—I _______ in front of the library. [ ]
A. stand
B. standing
C. was standing