31. Researchers now have some proofs ___
题型：选择题
问题：
31. Researchers now have some proofs ______ reading the Roman alphabets and Chinese
characters uses different parts of brain.
where B. when C. which D. that
31. Researchers now have some proofs ______ reading the Roman alphabets and Chinese
characters uses different parts of brain.
where B. when C. which D. that