专四

单选题
[A] offers
[B] offered
[C] offering　　
[D] to offer

参考答案：C进入在线模考
句子结构题。句意为：……这为对不同的饮酒量对孩子出生后造成的影响的研究提供了不受人为干预的实验。结合上下文可以看出，整个句子的主句为Approximately a third of pregnant women report drinking at least some alcohol，而句子的后半部分为伴随状语，因此选择现在分词offering。

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