He was surprised that his wife

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答案D是错的,b是对的
因为rob sb of sth 是一个固定搭配,但是这题中没有提到被抢了什么东西,只是说他妻子被抢劫了.所以不要of
如果有of,that后面的主语应该是物体,比如his wife's bag,watch,jewellery ,money 等.
======以下答案可供参考======
供参考答案1:
D供参考答案2:
b