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The man we followed suddenly stopped and looked as if ( ) ..

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The man we followed suddenly stopped and looked as if ( ) ..
The man we followed suddenly stopped and looked as if () whether he was going in the right direction.
A.to see
B.seeing
C.to have seen
D.having seen
为什么不选B?求逐项分析.
句子还原:The man we followed suddenly stopped and looked as if (he was to see) whether he was going in the right direction.
在状语从句中,主语+be常略.
再问: 那简单地说,怎么判断一个句子是不是状语从句。