接着上题，静止坐标系中的电流isα和isβ变换到两相旋转坐标系中的电流isd和isq后，isd为多少倍的Imsin(ωt-ψ)：

She looks happy____the examination. A: to having passed B: to pass C: to have passed D: to being passed

Both Tom and Mary （） the exam. A: has passed B: have past C: have passed D: had passed

His father ______ when he was only 6 years old. A: passed by B: passed away C: passed over

His grandmother brought him up, because his parents ________ when he was only one year old. A: passed away B: passed out C: passed off D: passed ove

Ten years ______ since we met in Beijing. A: passed B: passing C: C. have passed D: D. had passed

Centuries have _______. A: spent B: gone C: passed D: passed by

Peter has passed the test, _________. (and Laura has passed the test, too)

What is it about? Tell me ______ .A、what is it aboutB、what it is aboutC、what about it isD、what about is it

By the early 1980s, however, nearly two decades ________ since the changes in family life ________. A: . had passed … had begun B: . has passed … had begun C: . had passed … has begun D: . has passed … has begun