单项选择题
A. in case of B. at first sight of C. in front of D. for the sake of
This device looks simple enough, but () it is very comp...
单项选择题This device looks simple enough, but () it is very complicated.
A. on the surface B. in appearance C. as a rule D. in fact go
() they have the opportunity, many Americans take their...
单项选择题() they have the opportunity, many Americans take their vacations away from home.
A. However B. Wherever C. Whatever D. Whenever
He got mortally injured because of his faulty brakes. H...
单项选择题He got mortally injured because of his faulty brakes. He ()to see if his brakes were working properly.
A. must check B. should check C. must have checked D. should have checked
