1.It ______ ten years since we last ________ in Beijing.A.was;met B.has been;met C.was;meet D.is;m
1.It ______ ten years since we last ________ in Beijing.
A.was;met B.has been;met C.was;meet D.is;meet
2.The difficulty is ________ we haven't so many workers.
A.which B.that C.what D.why