—________ when has the country been open to international trade?
—1978，I suppose.
| A．Since | B．In | C．From | D．After |
相关试题
It’s suggested that everyone should_______ at least one hour a day to keep fit.
| A．work for | B．work out | C．work at | D．work on |
Our manager asked us to keep him _______ of what was going on there.
| A．informing | B．to be informed | C．informed | D．being informed |
The women carrying babies, come in first, ________?
| A．will you | B．will they | C．don’t they | D．don’t you |
The astronauts were so struck by ______beauty of nature that they took lots of pictures in _______space. 
21.
| A．the ; / | B．the; the | C．/; the | D．/;/ |
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