单选题
People were afraid to leave their house, ______ the police had been ordered to stand by in case, of emergency, they were just as confused and helpless as anybody else.
A、
and even if
B、
but since
C、
however after
D、
for though
【正确答案】
D
【答案解析】
for though是复合从属连词。for引导的句子是表示前面内容的原因或理由，though是该句中的从句。全句大意是：“人们不敢离开家，因为一旦出现紧急情况，虽有警察在旁待命，但他们也与其他人一样慌作一团，无能为力。”
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