自考《英语（二）》试题练习：连词词义区分（4.21）
单选题
[2009.01]He insured his car_______he had an accident.
A.unless
B.if
C.since
D.in case
单选题
[2009.01]He insured his car_______he had an accident.
A.unless
B.if
C.since
D.in case
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