4.I'll give you my friend's home address _____I can be reached most evenings.
A.which
B.when
C.whom
D.where
5.No decision ________about my future appointment until all the candidates have been interviewed.
A.will be made
B.is made
C.is being made
D.has been made
6.I have enjoyed my visit here.I'll be very sorry ________
A.for leaving
B.to leave
C.if leaving
D.to have left
4. D. where = by the address 在定语从句中作状语
5. B. 主句时态一般比从句时态前移
6. D. 先“离开"，之后才“感到遗憾”，因此用不定式的完成时
5. B. 主句时态一般比从句时态前移
6. D. 先“离开"，之后才“感到遗憾”，因此用不定式的完成时
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