My sister ____ be lazy． But now she's working really hard．（ ）
| A． |
used to |
| B． |
is used to |
| C． |
was used to |
You have got lots of masks． Could you please tell me_____？
Sure． I bought them in a shop in the neighborhood a few days ago．（ ）
| A． |
when did you buy them |
| B． |
where you bought them |
| C． |
when will you buy them |
| D． |
where you will buy them |
On January 29th， 2020，Zhong Nanshan and his team _____ over four hours online _____ five patients who were seriously ill， and made a treatment plan for those patients．（ ）
| A． |
spent；checking |
B． |
spent； to check |
| C． |
spend；checking |
D． |
spend；to check |
Is that Mary over there？
It _____ be her． She has gone to Kunming．（ ）
| A． |
may |
B． |
must |
C． |
can't |
D． |
mustn't |
It's 20 years since we came back to Liangshan．
How time flies! We _____ in our hometown for such a long time．（ ）
| A． |
work |
B． |
worked |
| C． |
has worked |
D． |
have worked |
It's dangerous for us to give too much _____ about ourselves on the Internet．（ ）
| A． |
messages |
B． |
suggestions |
| C． |
preparation |
D． |
information |