—Jane and July are here. Did I introduce them to you?
—No，you didn’t. I’ve seen them，but we__________.
A．hadn’t been introduced
B．haven’t been introduced
C．weren’t introduced
D．didn’t introduce
I can never forget the days _____ we worked together and the days ______ we spent happily together.
A．when; which B．which; when C．for which; that D．on which; when
There are six boys and two girls in the classroom; that’s eight _______.
A．at all B．in all C．after all D．above all
Who is that young woman ______ is standing over there?
A．whom B．that C．which D．who
You should not go rafting ________ you know how to swim.
A．if B．if not C．when D．unless
You can ______ this car with that one; then you will see which one is better.
A．match B．share C．compare D．measure
