摘要： It is not yet well understood has made the rainforest disappear year by year. A. what B. which C. that D. how 21-35 ACCDA DBDCA CBABA 单项填空精选34(共15小题.每小题1分.满分15分)
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It is not yet well understood _______ has made the rainforest disappear year by year.
A. what B. which C. that D. how
It is not yet well understood _______ has made the rainforest disappear year by year.
A. what B. which C. that D. how
It is not yet well understood ________ has made the rainforest disappear year by year．
- A.what
- B.which
- C.that
- D.how