单项选择题

Mr. Stone ______ the money order, otherwise he would have written back before now.

A．has received
B．ought to have received
C．couldn't have received
D．shouldn't have received
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单项选择题
______ we have finished the course, we shall start doing more revision work.
A．For now
B．Now that
C．Ever since
D．By now
单项选择题
The world ______ is made up of matter.
A．in that we live
B．on which we live
C．where we live in
D．we live in
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