It was only after he had read the papers Mr. Gross realized the task Before him was extremely difficult to pleteA.whenB.thatC.whichD.What
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B解析考查强调句型。only after he had read the papers是被强调的部分,Mr. Gross realized the task Before him was extremely difficult to plete句子成分完整,排除C、D;把It was和that去掉后不影响句意,因此是强调句,故选B。
【考点定位】强调句型it is...that。