A Train Floating On Air A train that floats on air? It's not magic―it's magnets (磁). And it's close to reality. In Virginia USA the fall of 2002, a train with no wheels traveled on ai
. ---The train hasn’t come yet. It is half an hour late. --- Yes. It __________ here at 2:02 as scheduled. A. must have been B. should be C. should have been D. must b