单项选择。
When does your father arrive ___ our school. [ ]
A. to
B. in
C. at
D. from
答案:C
—He was nearly killed by a car once.
—Oh, when was ______ exactly?
—It was in 2009 ______ he was riding a bike on the drive-way.
A.this; that
B.this; when
C.that; that
D.that; when
堆料时,煤由主皮带落入()皮带,然后由悬臂皮带堆入煤场。