6 He was barking ______let him in.

a. for someone to b. in case someone c. so someone to d. so that someone

answer : a

so that引导目的状语从句

in case 以防万一, 如果: +句子,(状语从句,不会出现将来式)

EG.:Bring your umbrella in case it rains

so表示结果 : 引导句子,so 一旦出现会加句子,而to 是不定式是非谓语

to do 不定式做目的状语

for sb to do sth = so that sb do sth

7 As soon as he______ the gate from the outside he comes into the garden.

a. will open b.opens c. is opening d. has been opening

Answer:b

as soon as引导状语从句

状语从句中使用一般现在时取代一般将来时

be opening强调动作正在发生

has been doing现在完成进行时强调从过去延续到现在,并且还将延续

Trouble with the Hubble科普性文章

科普性文章结构简单,句式单一,单词较难

学会逻辑阅读

at a cost of 花费

Hubble telescope看作一个整体, 在句中做主语

was launched 动词谓语

单词縮写一般都是组织或者机构

NASA National Aeronautics and Space Administration

(美国)国家航空和宇宙航行局

there was trouble with the Hubble

there be句型