摘要： It is believed that a new kind of drug by the scientists and they are hopeful that they will succeed in a couple of months. A. has been developed B. is being developed C. is developing D. has developed
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It is believed that a new kind of drug ______ by the scientists and they are hopeful that they will succeed in a few months.
A. has been developed B. is being developed
C. is developing D. has developed
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It is believed that a new kind of drug ______ by the scientists and they are hopeful that they will succeed in a few months.
- A.has been developed
- B.is being developed
- C.is developing
- D.has developed
It is believed that a new kind of drug ______ by the scientists and they are hopeful that they
will succeed in a couple of months.
will succeed in a couple of months.
[ ]
A. has been developed
B. is being developed
C. is developing
D. has developed
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B. is being developed
C. is developing
D. has developed
It is believed that a new kind of drug _____ by the scientists and they are hopeful that
they will succeed in a couple of months.
they will succeed in a couple of months.
[ ]
A. has been developed
B. is being developed
C. is developing
D. has developed
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B. is being developed
C. is developing
D. has developed
It is believed that a new kind of drug ______ by the scientists and they are hopeful that they will succeed in a few months.
| A．has been developed | B．is being developed |
| C．is developing | D．has developed |