—Why did he come back? —It is ______ he
题型:选择题
问题:
—Why did he come back?
—It is ______ he forgot to take his umbrella with him.
A.for
B.as
C.since
D.because
—Why did he come back?
—It is ______ he forgot to take his umbrella with him.
A.for
B.as
C.since
D.because