单选题：The door was open and on the ground________. [ ]A. lay a s..

So difficult ___it to work out the problem that I decided to ask Tom for advice.A．I did findB．did I findC．I have foundD．have I found

The door opened and in _____.A．he cameB．came heC．did he comeD．did Mr Smith come

_____ that he didn't know what to say. [ A. So moved was the boy B. So moved the boy was C. So the boy was moved D. So was the moved boy

Next door to ours _______, who has just returned form abroad.[ ]A. where lives an old manB. where does an old man liveC. lives an old manD. does an old man live

Not only _________ able to dance, but also _________ able to sing many English songs. A．he was; he wasB．was he; was heC．was he; he wasD．he was; was he