单项选择题

If you plant two apple trees in one square yard of land, and the trees' productivity ______ decline.

A．is bound to
B．is determined to
C．is unlikely to
D．is related to
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单项选择题
They ______ themselves ______ the politician because they hoped he would become president one day. At last he did.
A．connected, with
B．combined, with
C．linked, up
D．attached, to
单项选择题
The middle-aged woman has been ______ with a serious illness for half a year; she is dying now.
A．laid down
B．laid off
C．laid up
D．laid in
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