|
|
The water in the tank ________ clean.
|
[ ] |
A. |
should
|
B. |
may
|
C. |
have to be
|
D. |
must be
|
|
|
答案:D
解析:
|
句意为“缸里的水必须是清洁的”。A、B项不能单独作谓语,故排除,C项中have与主语在数上不一致,故弃C选D。
|
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