Maggie ____the floor when she _____the door bell ring.A：was sweeping … heardB：swept … heardC：was sweeping … was hearingD：swept … was hearing
Maggie ____the floor when she _____the door bell ring.
A：was sweeping … heard
B：swept … heard
C：was sweeping … was hearing
D：swept … was hearing
相关考题：
－ Help yourself to the steak, Maggie. －(). A、Sorry, I've had enoughB、Thank you, HelenC、Help yourself to it, too
She’ll never forget her stay there ________ she found her son who had gone missing two years before.A. that B. whichC. where D. when
There was so much noise that the speaker couldn't make himself().A、heardB、hearingC、hearD、to hear
She'll never forget her stay there __________she found her son who had gone missing two years before.A.thatB.whichC.whereD.when
下列因素中，对横向静稳定性起增稳作用的有 Which of the following factors can increase the lateral static stability.A．上反角 dihedral angleB．下反角 anhedral angleC．后掠角 swept-back angleD．前掠角 swept-forward angleE．上单翼 high wingF．下单翼 wing
下列因素中，对横向静稳定性起增稳作用的有 Which of the following factors can increase the lateral static stability.A．上反角 dihedral angleB．下反角 anhedral angleC．后掠角 swept-back angleD．前掠角 swept-forward angleE．上单翼 high wingF．下单翼 low wing