Question

The problem he referred to _____ difficult, but is isn’t at all.

A．must be

B．seeming

C．seems

D．seem

Answer 1

C

考查seem的用法。句意“他指的那个问题似乎很难，但是一点也不（难）。”主语是The problem，he referred to是定语从句，主语是单数，故谓语也用单数。Seem是系动词，后加形容词，构成系表结构。故选C。