Achieving a high degree of proficiency(精通)in English as a foreign language is   not a mysterious _______ without scientific basis.
#11851
A
process
B
practice
C
procedure
D
program
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The careless driver is _______ for the traffic accident_______ yesterday.
#13481
A
to blame; happened
B
to blame; happening
C
to be blamed; happened
D
to be blamed; happening