1,2,3,4

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1,2,3,41,2,3,4 1,2,3,41.begintodoubt1.begantosuspect2.

1,2,3,4
1,2,3,4

1,2,3,4
1.begin to doubt

1. began to suspect 2.

1 2 3 4 1 2 3 4 1 2 3 4 1,2,3,4, 1 2 3 4 1 2 3 4 1,2,3,4, 1,2,3,4, 1,2,3,4, 1,2,3,4, 1 2 3 4 1,2,3,4, 1,2,3,4, 1,2,3,4, 1、2、3、4 1+2+3×4 1,2,3,4 1+2+3+4+.