All _____ is useful to us is good.
A. which
B. what
C. that
D. whether
查看答案
Is this factory ____ we visited last week?
A. where
B. that
C. which
D. the one
she will never forget the day ____ she spend in Beijing.
A. when
B. what
C. which
D. why
This is the school _____ my father worked 20 years ago.
A. that
B. when
C. which
D. where
This is the very factory ____ we visited last year.
A. that
B. which
C. what
D. the one
微信支付 
支付宝支付