Some exchange students _______ with their host families this time yesterday．（ ）
| A． |
are chatting |
B． |
will chat |
| C． |
were chatting |
D． |
have chatted |
Some exchange students _______ with their host families this time yesterday．（ ）
| A． |
are chatting |
B． |
will chat |
| C． |
were chatting |
D． |
have chatted |
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