单项选择题

He (stood) on tiptoe, (stretching) as far as he could, (however), still, he (could not reach) the book.

A．stood
B．stretching
C．however
D．could not reach
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单项选择题
It is (largely) through perspiration, (or) the evaporation of water (through) the pores, that humans(rid them) of excess moisture.
A．largely
B．or
C．through
D．rid them
单项选择题
Unless (they are so permitted) by the attending (physician), no visitors or relatives (can) enter, the (patient's) room
A．they are so permitted
B．physician
C．can
D．patient's
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