There ____ .
A. come they B. they come
C. they are come D. they will come
So quickly ____ popular that some people who think his style is vulgar（庸俗的）are worried.
A. has Xiao Shengyang become B. Xiao Shenyang has become
C. had Xiao Shengyang become D. Xiao Shenyang became
Only after I had known him for some time to appreciate his real worth.
A. do I begin B. did I begin
C. I began D. had I begun
Is it the burning of more fossil fuels ______ is resulting in this increase in carbon dioxide ?
A. as B. which C. what D. that
Was it when you were talking with a friend under the tree ______ your bike was gone? www.7caiedu.cn
A. that B. where C. which D. while
He is a good student，and works very hard；.
A. so it is with her B. so was she
C. so she is D. neither does she
