【題目】The students (受益于) these after-school activities since then.

【答案】have benefited from
【解析】have benefited from 考查時態(tài)。本句的時間狀語是since then，該時間狀語通常和現(xiàn)在完成時連用。句意：從那時起，學生們動課外活動中收益很多。

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