Only after he had spent several nights working on the math problem _______ to wonder whether the problem was wrongly set.
A．that he began B．did he begin C．then he beganD．so that he began
B
only +狀語位于句首要用部分到裝。 句意：只有花費了數(shù)晚計算這道數(shù)學(xué)題之后他才開始懷疑是否問題出錯了。
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