Professional people appreciate _____ when it is necessary to cancel an appointment.
Ayou to call them
Byour calling them正確答案
Cthat you should have called them
Dthat you are calling them
答案與詳解
為什麼答案是 B
appreciate 後接動名詞（V-ing）作受詞，your 為動名詞 calling 的邏輯主詞，符合正式英文用法。
載入中…
