单项选择题
A. has ecome infected B. has become infecting C. had become infected D. had become infecting
Mary saw her son ______ the piano when she came to the ...
单项选择题Mary saw her son ______ the piano when she came to the room.()
A. playing B. play C. played D. to play
"Where is Mr. Liu" "You can find him whether in library...
单项选择题"Where is Mr. Liu" "You can find him whether in library or ______ home."()
A. in B. at C. from D. with
Our maths teacher is a man whom everyone looks ______.(...
单项选择题Our maths teacher is a man whom everyone looks ______.()
A. up B. up to C. on D. in
