中等ENGL-TENS-007
After he ______ his homework, he went out to play with his friends.
A. was finishing
B. has finished
C. had finished✓ 答案
D. finishes
解說
The past perfect ('had finished') shows the homework was completed before the past action 'went out'. 'Was finishing' describes an action still in progress at that past moment; 'has finished' is present perfect and 'finishes' is present simple, neither of which fits a past narrative.