______Newton started to do experiments， he forgot about the time.A.IfB.AsC.OnceD.When
______Newton started to do experiments， he forgot about the time.
A.If
B.As
C.Once
D.When
B.As
C.Once
D.When
参考解析
解析：本题考查连词词义辨析。
题目意为“只要牛顿开始做实验，他就忘记了时间。” A选项“如果”，B选项“当……时”，C选项“只要……就”，D选项“当……时”。B、D选项意思相同，排除掉。根据题意，应该选择once“只要……就”。
题目意为“只要牛顿开始做实验，他就忘记了时间。” A选项“如果”，B选项“当……时”，C选项“只要……就”，D选项“当……时”。B、D选项意思相同，排除掉。根据题意，应该选择once“只要……就”。
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