题目内容：
She was so touched by his generosity that for a moment she was（ ）a loss for words.
at
答案解析：
选择题：She was so touched by his generosity that for a moment she was（ ）a loss for word
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My husband sympathized（ ）my proposal to move to a new apartment.with
My husband sympathized（ ）my proposal to move to a new apartment.with
Ms.Green has been living in town for only year,yet she seems to be acquainted（ ）
Ms.Green has been living in town for only year,yet she seems to be acquainted（ ）everyone who comes t
Monica was urgent（ ）me for further particulars.with
Monica was urgent（ ）me for further particulars.with
Californians and New Englanders speak the same language and abide（ ）the same fed
Californians and New Englanders speak the same language and abide（ ）the same federal laws.by
已知函数求f′（x），并求f（x）的极值。
已知函数求f′（x），并求f（x）的极值。