It is difficult for her to make the final decision now, _____ she is in a delicate situation.

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问题 It is difficult for her to make the final decision now, _____ she is in a delicate situation.

选项 A、if
B、unless
C、until
D、since

答案D

解析 四个词中,只有since可以引导原因状语从句,表示“由于,因为”的意思,故选D。
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