______ we know, the air quality in the city has improved over the past two years.
| A．That | B．As | C．What | D．It |
相关试题
Tipping is neither encouraged nor common, although visitors may reward special services if they wish, _________ 10% of the bill is enough.
A which B where C in whichD in which case
Though ______ to see us，the professor gave us a warm welcome。
A. surprise B was surprised C. surprised D. being surprised
—Have you finished the book？
-- No. I’ve read up to _____ the children discover the secret cave.
| A． which | B． what | C． that | D．where |
Barbara is easy to recognize as she’s the only of the women who ____ evening dress.
| A． wear | B． wears | C． has worm | D． have worm |
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