—Hello, can I speak to Mr. Smith? —I’m s
题型:选择题
问题:
—Hello, can I speak to Mr. Smith?
—I’m sorry, but it is 3 weeks _____ he worked here.
A.before
B.since
C.after
D.while
—Hello, can I speak to Mr. Smith?
—I’m sorry, but it is 3 weeks _____ he worked here.
A.before
B.since
C.after
D.while