单选题：_____I'm mistaken, I've seen that tall man at a party befo..

—I’m afraid you missed a fantastic lecture yesterday. How come you were absent from it?—If you _______ know, I asked for a day off and visited a relative of mine in hospital.A．mightB．mayC．shallD．must

He cannot say he has fully understood Chinese, ____ he has been to China for many times.A. ever since B. now that C. even though D. only if

— Mr. Wang, I got zero on Answering Sheet One. Could you help me correct it?— I’m sorry, but it ______ be marked by the machine. Mark your test number with a pencil 2B next time.A．needB．willC．shallD．can

— How did you go home after the party last night?— Well，there were no buses _____ we had to walk.A. so as to B. in order toC. so that D. in order that

(2013·东北三校二模)—In case anyone ________ come in my absence, tell him I will be back soon.—Sure, I will.A．would B．shouldC．will D．shall