单选题：Mr Smith ________ his wife and daughter ________ going to th..

There are many kinds of sports , _____ my favorite is swimming . [ ]A. as B. then C. so D. but

What an unforgettable experience!I'll write it down _____ it is still fresh in my memory.[ ]A. sinceB. whileC. afterD. until

—Why didn't you chat with that friendly foreigner just now?— I'd like to, but the trouble was ________ he said was difficult for me to understand. [ ] A. what which B. that whatC. that thatD. what that

Tomwasabouttoclosethewindow_____hisattentionwascaughtbyabird.[ ]A.whenB.if C.andD.till

He found it increasingly difficult to read,__________his eyesight wasbeginning to fall.[ ]A. though B. for C. but D. so