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2. When I came to visit her last night, she ________ dinner.
A. is having
B. was having
C. has
D. had
-> When + S + QK, S + QKTD.
3. He began to feel ill while ___________________.
A. he is doing the exam
B. he did the exam
C. he will do the exam
D. he was doing the exam.
-> S + QK + While + S + QKTD.
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