__ many times, but she still didn't know how to do it.
| A．She was taught | B．Having taught | C．Having been taught | D．She has taught |
What he said didn’t mean to hurt Mary, but he felt ________ it differently.
| A．he could express | B．he could have expressed |
C．he would express | D．he must have expressed |
If we expect ________ much cleaner world, we should attract ________world’s attention to protect the world.
| A．a; a | B．a; / | C．a; the | D．the; / |
.His plan was such a good one _________ we all agreed to accept it.
| A．so | B．and | C．that | D．as |
.Because of my poor memory, all ____ you told me has been forgotten.
| A．that | B．which | C．what | D．as |
The old house we paid a visit _____ at the top of the hill.
| A．standing | B．to stand |
| C．to standing | D．to stands |