I had been looking for the book for two days ______I found it at last.
A. until
B. when
C. before
D. while
He criticized the students ________they did anything wrong.
A. However
B. whenever
C. whatever
D. whichever
No sooner had we arrived at the cinema _______the film began.
A. before
B. than
C. as soon as
D. when
Hardly had we reached home _______it began to rain.
A. than
B. before
C. when
D. as soon as
微信支付 
支付宝支付