Question

С объяснением, спасибо! I was surprised that Kate wasn’t at the morning yesterday. She ___ about it.
a)may not know b)may not have knew c)might not knew d)might not have known.

Answer 1

I was surprised that Kate wasn’t at the morning yesterday. She ___ about it.

d)might not have known.

Модальный глагол might + Perfect Infinitive указывает на выражение неуверенности в уже произошедшем действии.