题目内容
They were surprised that a child should work out the problem ________ they themselves couldn’t.
[ ]
A.once
B.if
C.then
D.while
答案:D
提示:
提示:
|
句意为“他们很惊讶,一个小孩子能做出这道题来,而他们却不能”。while在此处强调对比,意为“然而”。 |
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