1.We learned in the textbooks that heat _______ water. (A)evaporated
(B)was evaporated (C)has evaporated (D)evaporates
请问为何是D,看到题目过去式我就选A了。。。
2.I ______ to call a friend in Scotland and for the last two hours but the lin
e is still engaged. (A)tried (B)have been trying (C)had been trying (D)had tri
ed