【題目】Tigers wait ______ it is dark, and then they go out to find their food.

A. unless B. as C. because D. until

【答案】D

【解析】

句意:老虎一直等到天黑,然后他們出去找食物。unless除非,as當(dāng)……時候,because因為,until直到。此處表示一直等到天黑,然后出去找食物,故用連詞until。故選D。

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