20. It is only in the last sixty years that　　　　 any evidence that Loch Ness Monster might exist.

A．there has been　 　　 B．there was　　 　　　 C．it has been　　　 　　　　 D．it had

19.________all his courage, he invites Celine to get off the train with him．

A．To gather　 　 　　　B．Gathered　 　　　 　C．Gathering 　　　 　　　　D．Being gathered