—Look! Here comes our school bus. —No hu
问题:
—Look! Here comes our school bus.
—No hurry. Don't get on it ______ it has stopped. [ ]
A. until
B. after
C. since
D. when
—Look! Here comes our school bus.
—No hurry. Don't get on it ______ it has stopped. [ ]
A. until
B. after
C. since
D. when