Every possible means ______, but none proves successful.
| A．has tried | B．have been tried |
| C．is being tried | D．has been tried |
相关试题
He seemed______ to me at the party last month, but I can’t remember well now ．
| A．to introduce | B．to have introduced |
| C．to be introduced | D．to have been introduced |
It is reported that a car went out of______ control on a high way______ north of Tangshan and three people got killed．
| A．the; the | B．不填; the | C．the; 不填 | D．不填; 不填 |
We ______ last night, but we went to the concert instead．
| A．must have studied | B．might study |
| C．should have studied | D．would study |
In no way ______leave ______ little children alone．
| A．we must; so | B．must we; such | C．must we; so | D．we must; such |
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