He ___________ his guitar when his friend arrived. A. played B. plays C. was playing D. has played
He ___________ his guitar when his friend arrived.
A. played
B. plays
C. was playing
D. has played
Đáp án C
Một hành động đang xảy ra bị một hành động khác xen vào:
S + were/ was + Ving + when + S + v2/ed
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