Twenty-five percent of the water in this river _____ dirty in the past.
A. is B are C. was D. were
相关试题
—How do you like the scarf?—I love it. It feels _______.
| A．hard | B．cool |
| C．sweet | D．soft |
—How many new words are there in _______lesson?
—There are only _______.
| A．five; fifth | B．fifth; five |
| C．the fifth; the five | D．the fifth; five |
My neighbor asked me _______ I heard the big noise last night.
| A．why | B．whether | C．that | D．what |
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