Question

The student will never forget those days________several soldiers took turns to look after him after the earthquake.

A．that                                                   B．which 

C．when                                                D．where

Answer 1

C　when引導(dǎo)定語(yǔ)從句修飾先行詞those days，并在從句中作時(shí)間狀語(yǔ)。