1.When asked how a statue from distant Greece could have appeared in China...

当被问及来自遥远希腊的塑像怎么会出现在中国时...... "when＋过去分词"是状语从句的省略结构。 If properly treated，waste will do no harm to the environment.

如果废物妥善处理，就不会对环境造成危害。 2.In 334 BC，he took his army，now with 42，000 men，into the Middle East and then Egypt，defeating every army that stood in his path.

公元前334年，他率领当时已达4万2千人的军队进入中东，接着是埃及，所向无敌。 "defeating..."是现在分词短语作伴随状语。 All night long he lay awake，thinking of the problem.

他整夜躺在床上睡不着，思考着那个问题。 3.Many students got embarrassed and even angry when this happened，while others changed their opinions.

当这种情况发生时，许多学生感到尴尬甚至气愤，而另外一些学生则改变了他们的观点。 "got embarrassed"是"get＋形容词/过去分词"式的"系表结构"。 Besides，some students got cheated online.

此外，一些学生在网上上当受骗。

　　 no doubt无疑，确实

　　(教材P58)When asked how a statue from distant Greece could have appeared in China，researchers explained that no doubt this was a result of Alexander the Great's influence.

　　当被问及来自遥远希腊的塑像怎么会出现在中国时，研究人员解释说，这无疑是亚历山大大帝的影响所致。

　　(1)There's no doubt about/that... 毫无疑问

　　There's doubt about/whether... 对......有怀疑/疑问

　　beyond/without doubt＝certainly 无疑地，确实地

in doubt 不肯定，没把握