David has made much progress this term.---,and----- A.So he has;so you have B.So has he; so have you C.So he has;so have you D.So has he;so you have _______ the last bus,we had no choice but to take a taxi. A.missing B.missed C.being missed D.having missed Only when the meeting began_______ that he had left his papers at his office A.he realized B.did he realize C.should he realize D.will he realize 句型转换 Walking and riding your bike are effective;doing school sports are effective too Walking and riding your bike areeffective,and_______________________________