选择:I can't help but ( ) he was hiding something.A.to think B.think C.thinking D.thought为什么选B而不选D?

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选择:I can't help but ( ) he was hiding something.A.to think B.think C.thinking D.thought为什么选B而不选D?
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选择:I can't help but ( ) he was hiding something.A.to think B.think C.thinking D.thought为什么选B而不选D?
选择:I can't help but ( ) he was hiding something.A.to think B.think C.thinking D.thought
为什么选B而不选D?

选择:I can't help but ( ) he was hiding something.A.to think B.think C.thinking D.thought为什么选B而不选D?
答案:B
can't help but do sth.禁不住,忍不住;情不自禁做某事

主句是现在时

B. think
but 连接, 前后时态要一直,前面用的help ,后面就要用 think

can't help but do sth,can是情态动词后面肯定要加动词原形了