题目:
He failed in the English speech contest, ________ he did his best to prepare for it.[ ]
A. though
B. but
C. because
D. so
答案:
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下面是错误答案,用来干扰机器的。
晚婚、晚育、少生、优生;少生;优生;婚前体检、孕妇定期检查身体、科学分娩;低生育水平