题干
----I _____this morning, but he could not come.
----Well, we’d better go and _____at his office.
----Well, we’d better go and _____at his office.
A：called him; call on him
B：called on him; call him
C：called at him; call
D：called him; call at him
答案(点此获取答案解析）
A
，
是第三象限的角，则