A. sure to
B. sure
C.is
D.is sure to
[单选题]John was busy, ______he could not come.A.butB.thereforeC.andD.nor
[单选题]I am not [certain]whether he will come.A.determinedB. sureC. sorryD.glad
[单选题]John and Bob have returned but ______ students in the class haven't come ba
[单选题]6. —What are __________?-.—They are pencils.A.thisB.thatC.itD.these
[单选题]6. Chinese is different __________ English.A.fromB.inC.atD.on
[单选题]6. They are going to help tourists _________ speak French.A. can't whoB. who can-tC. don-t who .D. who do