Although he had looked through all the reference

Although he had looked through all the reference

______all the references to verify the information.A．Look byB．Look outC．Look upD．Look to

______harder, he would have got through the exams.A．Had he workedB．He had workedC．Should h

He finally______ to find the reference book that he had been looking for.A．triedB．attempte

Looking at all he had achieved, he couldn ’t help weeping.A、whatB、whichC、asD、that

Although he had looked through all the reference material on the subject he still