We think __planting trees will help the enxironment A.if B.whether C.that Dwhen

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We think __planting trees will help the enxironment A.if B.whether C.that Dwhen
We think __planting trees will help the enxironment A.if B.whether C.that Dwhen

We think __planting trees will help the enxironment A.if B.whether C.that Dwhen
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此题选【C】
翻译为：我们认为植树可以改善环境.
从句不缺少成分,而且这是在说明一种想法所以不选其他的.

谢谢,不懂可追问
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填C. that。句意：我们认为种树对环境有帮助。
解释：think之后是一个宾语从句，而且是陈述句类型的，需要用that作为引导词，来连接主句We think和后面的从句。that本身是没有意思的，可以省略。

选A
if引导的句子是从句，主句是一般将来时

正解C
考察宾语从句， think 是发表看法，从句planting trees will help the environment 是个完整的句子不缺成分，用that 。

C。think后应是从句，可判断出是名词性从句，后面从句中不缺任何成分，所以不选D。根据句意，没有疑问的语气，所以排除A\B，选C。

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