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15.tools,a workshop,and some storage space were ____for early experiments in aviation.
a.required all that
b.all that was required
c.all the requirements that
d.such that all the requirements
答案是B,that指代前面的先行词ALL但为什么that后引导的从句的谓语动词用was而不是were?
39.today's nuclear fission are the remanats of (which) used to be a (much more) active mixture of radioactive and fissionable materials two billion (years ago) and (earlier).
答案是which错,为什么不可以用which呢?不是改错篇的page10中提到"名词+of which+谓语,of which修饰名词,名词在定语从句中作主语,后可直接跟谓语动词?
请大师指点!多谢! |