they spent as many hours as they could (to study)their lessons?这个地方用到什么语法?

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• they spent as many hours as they could (to study)their lessons?这个地方用到什么语法?
• They spent as many hours as they could -----their lessons为什么是填to study,而不是根据spend sth on sth,spend sth (in) doing sth,填studying为什么不对?
• - it's so cold today!- ( ) yesterday.括号中为什么选so was it ,而不选so did it.they think that () work hard is the key() success.A/;of B.to,toi often hear the old lady () in the next room.last night while i was reading in bed,i heard her () badly.a.cough;coughing b.coughing;coughthey spent as many hours as they could () their lessons.a.to study b.studyingLi Min studies English () the radio.a.on b.by
• not only but also有就近原则吗谢谢
• 英语翻译谁知道Set on-access to on-read rather than on-write or on-execute only这句话怎么翻译啊~计算机英语~