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
One of the (more intriguing) theories about the destruction of Ur is his contention that the population (may destroy) their ziggurats and (abandoned) their metropolis in anger against the deities that permitted (so long) a famine.
A．more intriguing
B．may destroy
C．abandoned
D．so long
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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