A. won't be seen
B. wasn't seen
C. hasn't been seen
D. hadn't been seen
[单选题]He( )the problem in his study for a long time.A.studiedB.was studyingC.has
We ______ for quite a long time.A. were keeping waitedB. were kept waitedC. were
[单选题]Nice to see you. I ______you for a long time.A.haven't seenB.didn't seeC.ha
[单选题]He read a book on the plane to( )away the time.A.whileB.throwC.wasteD.quick
He has failed twice but he’ll try _ _ _ third time.A. theB. the otherC. anotherD
Many years ago, the girl ( ) in London with her family for a long time.A. livedB
He promised to ()me up on my request next time he was here.A. putB. takeC. dress
Around the world, people changed sleep patterns thanks to the start or end of da
[单选题]He is the only one of the students who_____finished the task in time.A.isB.
He thought for a long time but still could not _______ a solution.A. take overB.