问题
选择题
—Where's Peter?
—He is over there. He _____ for the bus. [ ]
A. wait
B. waits
C. is waiting
D. waited
答案
答案：C
搜题请搜索小程序“爱下问搜题”
—Where's Peter?
—He is over there. He _____ for the bus. [ ]
A. wait
B. waits
C. is waiting
D. waited
答案：C
2AB（g）达到平衡状态的标志是