—Are you going to stay overnight?
—Not _____ it’s really necessary．
| A．unless | B．if | C．until | D．since |
The broken bike needs______.
| A．to repair | B．repaired | C．being repaired | D．repairing |
---Oh, it’s you! I ______ you.
--- I’ve just had my hair cut.
| A．don’t recognize | B．didn’t recognize |
| C．haven’t recognized | D．hadn’t recognized |
Great Changes ________in Shanghai since 2000.
| A．have been taken place | B．took place |
| C．had taken place | D．have taken place |
She still failed in the final exam___hard she worked.
A. whatever B wherever C. however D. whenever
Child ______ he is, he can speak four different languages.
A. as B. although C. if D before