【題目】—This wall of air is an effective answer to the problem and it ______ work.
—But it is a question to put such a wall of air around the statue.
A.may
B.must
C.should
D.could

【答案】C
【解析】should這里是推測用法,表示:應該。work在句中是“有效果,起作用”的意思。——這道氣墻是對這個問題的有效的解決方法,并且這氣墻應該會起作用 ——但是,如何在這雕像的周圍構(gòu)起這道氣墻卻是個問題。

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