With the help of high technology, more and more new substances ______ in the past years.
| A．discovered | B．have discovered |
| C．had been discovered | D．have been discovered |
相关试题
We had ____ fun at Mary’s birthday party last Sunday.
| A．a plenty of | B．a great many | C．a large number of | D．a great deal of |
On hearing his son’s survival, the worried mother _______
| A．burst into crying | B．burst out tears | C．burst into tears | D．burst into laughing |
He b
ehaves _______ he were better than us.
| A．even though | B．even if | C．as though | D．although |
The question of drug-taking is bound to(一定要) ______ at the next conference.
| A．come up | B．be come up | C．come up with | D．be coming up |
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