He doesn’t (say) in his letter (that) he’s going to (be back) (or not).

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问题 He doesn’t (say) in his letter (that) he’s going to (be back) (or not).

选项 A、them
B、that
C、be back
D、or not

答案B

解析 应改为whether。whether...or not...是固定搭配,表示“是否…”。
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