the parking regulations have bee stricter, more people will use public transport and leave their cars at home.
A. Now that
B. Even though
C. In case
D. In order that
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(答案→)A. Now that
B. Even though
C. In case
D. In order that
解析：A 考察状语从句。句义：由于停车规定变得更加严格，越来越多的人使用公交车，而把自己的车放在家里。Now that既然；even though即使，虽然；in case以防，in order that为了，以便。故A正确。