下列命题公式中,哪些是合取范式?
A. P析取Q
B. P合取Q
C. P
D. (P析取Q)合取R
If there is a lot of work _________.I’m happy to just keep on until it is finished.
A. to do
B. to be doing
C. done
D. doing
Most colleges now offer first-year students a course specially ________ to help them succeed academically and personally.
A. designed
B. designing
C. to design
D. being designed
______ his love, Chris sent his mom a thank-you note on Mother’s Day.
A. Expressing
B. Expressed
C. To express
D. Having expressed