MANY SPECIES HAVE BECOME EXTINCT EACH YEAR BEFORE BIOLOGISTS CAN...

33. - File thứ 4: anh12cb_231201916
File thứ 4: anh12cb_231201916

33. Many species have become extinct each year before biologists can identify them.

A. drain

B. destroy

C. discover

D. endanger

VI. Identify the one underlined word or phrase that must be changed for the sentence to be correct