30. It was only after he had read the papers Mr. Gross realized the task before him was extremely difficult to complete.
(A) when
(B) that
(C) which
(D) what

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詳解 (共 1 筆)

#1202116
考查强调句。题干可还原为：Mr. Gross realized the task before him was extremely difficult to complete only after he had read the papers，即可判断为强调句，因此填that。
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