这道题的解题过程是？— How long do you t
—Howlongdoyouthinkitwillbe_____Chinasendsamannedspaceshiptothemoon?—Perhapstwoorthree...
— How long do you think it will be _____ China sends a manned spaceship to the moon? — Perhaps two or three years. [ ] A. when B. until C. that D. before
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