单项选择题

(As gentle as possible), and (with help from) an assistant, the veterinarian examined the hippo to determine (if) (she) was pregnant.

A．As gentle as possible
B．with help from
C．if
D．she
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单项选择题
A rigorous alertness (must be) (adhered) when (notetaking) with the inessential ignored (and) the superfluous eliminated.
A．must be
B．adhered
C．notetaking
D．and
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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