Question

— The woman biologist stayed in Africa studying wild animals for 13 years before she returned.  
— Oh, dear ! She ______ a lot of difficulties !

A．may go through	B．might go through
C．ought to have gone through	D．must have gone through

Answer 1

D

此句是对已经发生的事情的肯定的猜测，故排除A、B。根据句意，排除C。故答案为D。