{01}8. He was so deep in thought, thinking of the problem ______ he knocked into the tree without noticing it.
A.when
B.while
C.because
D.That
解析:略 本题选D。 {02}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 解析:略 本题选D。 {03}55. Give the message to ______ is at the table.
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