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Mrs Grey preferred to ride a bicycle to work___it was a rain

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Mrs Grey preferred to ride a bicycle to work___it was a rainy day ,__it gave her some exercise.47
Mrs Grey preferred to ride a bicycle to work___it was a rainy day ,___it gave her some exercise.
A except ,and
B unless,for
C only if,when
D until,because
要答案和理由
,并解释一下为什么其他答案不可以,最好详细一点
475
答案是B.意为如果不是雨天Grey夫人更喜欢骑自行车去上班,因为可以得到锻炼.unless=if not,for表原因.A中except不可直接加句子,and不合理.C和D意思不正确.