题目内容
Scientists say they are beginning to _____ in the fight against cancer.
- A.break in
- B.break out
- C.break down
- D.break through
D
解析:
break through突破 break in打断 break out爆发 break down坏掉。
解析:
break through突破 break in打断 break out爆发 break down坏掉。
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