--_____students have joined the English club since last term.
--I think _____ them is 200.
A. A number of; a number of
B. The number of; the number of
C. A number of; the number of
-Tom has no difficulty passing the final exam.
--________, and ____________.
A. So he has, so have you
B. So does he, so you do
C. So he does; so do you