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问题

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
正确答案是:
同类题型

Would you drop in at my house this afternoon if _______

There is still something we can try _____ those dyinganimals.

Thebedhasbeen_______inthefamily.Itwasmygreatgrandmother’soriginally.

try to understand ____ that prevents so manyAmericans from being as happy as one might expect, it seems to me that thereare two causes.

We Chinese ____ our soldiers who did so much for the suffering people there during the Wenchuan earthquake.

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