Question

I'm absolutely sure! They __________ yesterday. Tom showed me his train ticket.

should have arrived
must have arrived
could have arrived

Answer 1

Respuesta:

must have arrived

Explicación:

Answer 2

Respuesta:

I'm absolutely sure! They must have arrived yesterday. Tom showed me his train ticket.

Explicación:

"Estoy absolutamente seguro! Ellos deben haber llegado ayer. Tom me mostró su tiquete de tren"

should = debería

could = podría

En la oración el personaje no habla de una posibilidad, si no de algo de lo que está convencido.