They are discussing_____go there or not.

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问题 They are discussing_____go there or not.

选项 A、if they should
B、whether should they
C、whether to
D、whether they should

答案D

解析 从主句中的“They are discussing about…”中可知介词后面的宾语从句必须用“whether”连接,而宾语从句又必须用陈述语序,故只有选用“whether they should”才是正确的。
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