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  3. Before you leave the office, __________ all lights are out.A．see which B．seeing

Before you leave the office, __________ all lights are out.A．see which B．seeing

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问题 Before you leave the office, __________ all lights are out.
选项 A．see which
B．seeing that
C．to see that
D．see to it that
答案D
解析考查祈使句。句意为“在你离开办公室前，__________所有的灯都已关闭”。根据句意可知，后半句应为祈使旬，表示一种命令或建议，因此，空格处应填入动词的原形形式，see to it that“确保”，其他选项形式皆不符合题意，故选D。
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