13. The struggle against the bird flu and the suffering _________ brought about have become a big concern across the world.
| A．which has | B．it is | C．it has | D．what is |
相关试题
We can relax ourselves by taking part in school activities after long hours’ study; _______, we
can learn a great deal from other students.
| A．therefore | B．but | C．however | D．besides |
Some buildings in the past ______ down and new ones are being built there.
| A．will be pulled | B．had been pulled | C．have been pulled | D．are pulling |
The movie, ______ in a family of three generations in Shanghai in the 1940s, enjoyed a great success.
| A．set | B．to set | C．was set | D．setting |
It’s nearly 7 o’clock. Helen _______ come, but let’s wait for her for another 5 to 7 minutes.
| A．couldn’t | B．can’t | C．mustn’t | D．may not |
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