.—____ when has the country been open to international trade?
—1978, I suppose.
| A．Since | B．In | C．From | D．After |
“Have you seen _____ pen? I left it here this morning.” “Is it _____ black one? I found it in the corner.”
| A．a, the | B．the, the |
| C．a, a | D．the, a |
5. “Have you seen _____ pen? I left it here this morning.” “Is it _____ black one? I think I saw it somewhere.”
| A．a, the | B．the, the |
| C．a, a | D．the, a |
We hired _______ one-eyed man to play in our film, and we gave him _______ 100-pound check for just one minute.
| A．a, an | B．an, a |
| C．a, a | D．an, an |
Before he was arrested, he had taken _______ one-month holiday, and stayed in the country with ________ 18-year-old girl, one of his students.
| A．a, a | B．an, an |
| C．a, an | D．an, a |
I once watched _______ one-act play, which was played by _______ 11-year-old boy.
| A．a, a | B．an, an |
| C．a, an | D．an, a |