单项选择题

By the end of this century intelligent robot ______ to do most of the housework for man.

A．is expected to be invented
B．will have been expected to be invented
C．has been expected to be invented
D．is expected to have been invented
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单项选择题
Mary remained in her belief that the present situation would definitely improve.
A．continuous
B．persistent
C．constant
D．resolute
单项选择题
Going out for a holiday is a good way to relax and refresh yourself, and this is especially true______ it comes to preventing depression.
A．since
B．before
C．after
D．when
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