1.Thedays＿＿hespentinAustraliawereveryexciting.A./(正确)B.whenC.inthat2.Istillremembertheday＿＿IjoinedtheYoungPioneer.A.onthethatB.when(正确)C.which

Question

1.The days＿＿he spent in Australia were very exciting.
A./ (正确)
B.when
C.in that
2.I still remember the day＿＿I joined the Young Pioneer.
A.on the that
B.when (正确)
C.which

Answer 1

前一句,定语从句,即the days在后面从句中充当成分,后面句子作为定语修饰the days,所以选a.也可以用that/which.
后一句,状语从句,表示时间,所以用when