Cedric Bakambu’s early strike ensured DR Congo stayed within two points of Senegal.
The Real Betis striker smashed home from the edge of the box after Fiston Mayele won possession in midfield and threaded through a clever pass.
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Despite Togo dominating the later stages, Aaron Wan-Bissaka and Chancel Mbemba held firm in defence.
To qualify automatically, DR Congo must now beat Sudan and hope Mauritania upset Senegal in Dakar.