单项选择题

I would never have believed it was possible if I ______ it with my own eyes.

A．didn't see
B．don't see
C．won't see
D．hadn't seen
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单项选择题
Mr. Wang and his son, both looking very happy, ______ taking a walk in the park.
A．are
B．is
C．has
D．have
单项选择题
______ problems you have, ask Harry here to help you. He knows everything.
A．However
B．Whatever
C．Whenever
D．Wherever
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