【题目】It remains to be seen whether online teaching will ________ traditional classroom teaching.
A.replace
B.rebuild
C.recover
D.reserve

【答案】A
【解析】句意：在线教育是否将会取代传统的课堂教育还有待观察。A. replace“取代”；B. rebuild“重建”；C. recover“恢复”；D. reserve“储备，预定”。根据语境，故选A。