【題目】他們突然想到對于這個學生來說解決這個問題是多么困難。（hit/strike/occur）

【答案】It hit / struck/ occurred to them how difficult it was for the student to solve the problem.
【解析】It hit / struck/ occurred to固定句型，“突然想到”；solve the problem固定短語，“解決問題”；根據(jù)句意，用一般過去時。因此答案：It hit / struck/ occurred to them how difficult it was for the student to solve the problem.

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