单选题：My computer ____start, no matter how hard I try.-lt might h..

______ you put the sun there there did the movements of the other planets in the sky make sense.A. If only B. If so C. Only if D. As long as

I told Sally how to get here, but perhaps I ______for her.A．had to write it outB．must have written it outC．should have written it outD．ought to write it out

The man ran out of the room _____ I could say goodbye.A. as B. since C. until D. before

______ I'm well again, I can go on with my work.A. Even ifB. As though C. Ever after D. Now that

I don't know _____ he gets along well with his lessons.A. how B. that C. whether D. what