问题
选择题
_______ all my letters, I had a drink and went out for a walk.[ ]
A. Finished
B. Having finished
C. Finishing
D. To finish
答案
答案：B
搜题请搜索小程序“爱下问搜题”
_______ all my letters, I had a drink and went out for a walk.[ ]
A. Finished
B. Having finished
C. Finishing
D. To finish
答案：B
sin100πt （V）的 正弦交流电源，图中电流表内阻不计．副线圈接入“110V，60W”灯泡一只，且灯光正常发光．下列说法正确的是（ ）
/22 A