第 1 题 · 四级
He wore dark glasses as a disguise, which made him hard to recognize.
核心词：disguise dɪsˈgaɪz n. 伪装；v. 掩饰
他戴着墨镜伪装自己，让人难以认出。
一般过去时as a disguise + which 从句 + hard to do短语 in disguise短语 a blessing in disguise
He wore dark glasses as a ___, which made him hard to recognize.
第 2 题 · 四级
A herd of elephants crossed the road, which stopped the cars for an hour.
核心词：herd hɜːd n. 兽群；v. 放牧
一群大象穿过马路，让汽车停了一小时。
一般过去时a herd of + which 从句 + stop sb for短语 a herd of短语 herd behavior
A ___ of elephants crossed the road, which stopped the cars for an hour.
第 3 题 · 四级
The machine needs constant care, which the workers give it every day.
核心词：constant ˈkɒnstənt adj. 不断的，持续的
这台机器需要持续的维护，工人们每天都照顾它。
一般现在时need + 名词 + which 从句短语 constant care短语 a constant stream
The machine needs ___ care, which the workers give it every day.
