—Mr. Wang is in Nanjing for a trip.
—Oh, really? When ______ he ______ the trip?
A. does; start B. will; start C. did; start D. is; starting
—Mr. Wang is in Nanjing for a trip.
—Oh, really? When ______ he ______ the trip?
A. does; start B. will; start C. did; start D. is; starting
C