It is quite common for a working man to make ______ for his old age by putting aside enough money to live on.
#83628
A
adjustment
B
supply
C
assurance
D
provision
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Please tell me how the accident_____. I am still in the dark. 
#69892
A
came by
B
came out
C
came to
D
came about
.I don’t think that the sentence need ______again.
#75504
A
explaining
B
be explained
C
to be explained
D
explaination