Because the shop _________, all the T-shirts are sold at half price in it.
| A．has closed down | B．closed down |
| C．is closing down | D．had closed down |
The outbreak of Covid﹣19 has meant an ______ change in our life and work．（ ）
| A． |
absurd |
B． |
abrupt |
C． |
allergic |
D． |
authentic |
If I hadn't been faced with so many barriers，I ______ where I am．（ ）
| A． |
won't be |
B． |
wouldn't have been |
| C． |
wouldn't be |
D． |
shouldn't have been |
There will still be lots of challenges if we are to ______ garbage in a short time．（ ）
| A． |
clarify |
B． |
justify |
C． |
satisfy |
D． |
classify |
Instead of getting down to a new task as I ______， he examined the previous work again．（ ）
| A． |
had expected |
B． |
have expected |
| C． |
would expect |
D． |
expect |
It is not a problem ______ we can win the battle；it's just a matter of time．（ ）
| A． |
whether |
B． |
why |
C． |
when |
D． |
where |