It was only after he had read the papers    Mr. Gross realized the task Before him was extremely difficult to complete.
A．whenB．thatC．whichD．What
B
考查強(qiáng)調(diào)句型。only after he had read the papers是被強(qiáng)調(diào)的部分，Mr. Gross realized the task Before him was extremely difficult to complete句子成分完整，排除C、D；把It was和that去掉后不影響句意，因此是強(qiáng)調(diào)句，故選B。
【考點(diǎn)定位】強(qiáng)調(diào)句型it is...that。
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