【单选题】【消耗次数：1】
3. He ______ hard until I told him to sit down and have a break.
①
was working
②
had been working
③
worked
④
has worked
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相关题目
【单选题】
Had he worked hard, he _____ the exams.
①
must have got through
②
would have got through
③
would get through
④
could get through
【单选题】
If he had worked harder, he ___.
①
would succeed
②
had succeeded
③
should succeed
④
would have succeeded
【单选题】
They are working hard to____ what they have lost.
①
make out for
②
keep up with
③
catch up with
④
make up for
【单选题】
The boy worked hard ______ he could get the prize.
①
so that
②
so as to
③
so as
④
in order to
【单选题】
He____________ working as if nothing had happened.
①
continue
②
continues
③
continuing
④
continued
【判断题】
Before he began to study in the university, he had worked in a company for three years.
①
正确
②
错误
【单选题】
Tom is hard-working, so its _____________ that he won the match.
①
no wonder
②
a pity
③
a surprise
④
a mystery
【单选题】
When I worked as the general manager of the firm, I sometimes had ___ to visit London on business.
①
opportunity
②
possibility
③
occasion
④
chance
随机题目
【单选题】
以下哪项是正确的选项
①
人类基因组的全部基因约为1-2万个
②
人类基因组的全部基因约为2-2.5万个
③
人类基因组的全部基因约为3-4万个
④
人类基因组的全部基因约为7-8万个
【单选题】
以下哪项是错误的选项？
①
1909年，科学家们破译了基因的遗传密码
②
上世纪70年代，建立基因克隆技术和DNA测序方法
③
上世纪80年代，发明PCR技术，发明DNA自动测序仪
【单选题】
以下关于遗传病一级预防的具体措施哪一项不正确？
①
选择合适的遗传学检测方案，生育前提前了解遗传病生育风险
②
只需孕后三个月补充叶酸，有效预防神经管畸形的发生
③
植入前遗传学诊断（第三代试管婴儿技术）
④
避免近亲结婚生育和大龄生育