15. we decided to spend the night at the foot of the mountain.
| A．With the moon appeared | B．The moon appeared | C．The moon being appeared | D．As the moon appeared |
“Never for a second,” the boy says, “____ that my father would come to my rescue.”
| A．I doubted | B．do I doubt |
| C．I have doubted | D．did I doubt |
_____________ the sun for too much time will do great harm to your skin.
| A．Exposed to | B．Being exposed to |
| C．Exposing to | D．To expose to |
You should study the details of the policy________ before you sign it.
| A．in return | B．ahead of schedule |
| C．right away | D．on purpose |
Trees are good for man. We can’t plant them ______ many.
| A．so | B．such | C．too | D．enough |
—I saw Mr. Black on the playground this morning.
—You ________. He’s still on holiday in Sanya.
| A．can’t | B．couldn’t have |
| C．mustn’t have | D．needn’t |